Abstract: There is provided a flow passage control valve provided with a plurality of valves in a valve housing formed with set flow passages. A camshaft for operating each of the valves is provided along a right and left direction at the upper part of the valve housing. The respective valves are arranged so as to be divided front and rear into a first valve group and a second valve group with the camshaft as a border therebetween. The first valve group includes a first water passage valve, a second water passage valve, and a bypass valve. The second valve group includes the remaining valves that are not included in the first valve group.

Abstract: A method for fluid treatment that provides variable or alternative regeneration cycles within the same fluid treatment device. The duration of all stages of the regeneration cycle can be adjusted depending upon the amount of fluid treated so that regenerant resources such as water are not underutilized and waste is not discharged unnecessarily into the environment.

Abstract: In one embodiment, the present disclosure provides fail-safe mechanisms for final filters. The fail-safe mechanisms of the present disclosure include a prefilter that is essentially transparent or translucent to TOC contaminants and a microporous filter downstream from the prefilter that filters contaminants by means of size-exclusion, mechanical interception, coagulation, or a combination thereof, the filter being adapted to significantly reduce fluid flow and undergo blockage under a challenge by TOC contaminants.

Abstract: A computer based method for generating a pulsating water flow through a faucet in response to a filter status, comprising the steps of: determining a water flow rate through a first filter; determining a duration of water flow at said water flow rate; determining the filtered volume of water filtered by said first filter based upon said water flow rate and duration of water flow; determining the filter status by comparing said filtered volume of water and an expected rated service life value of said first filter; and causing the faucet to expel pulsating water when the faucet is in the on state, when the filter status represents that remaining filter life is below a first threshold.

Abstract: The invention provides a system for continuously monitoring a patient during hemodialysis. The system includes a hemodialysis machine for performing the hemodialysis process that features a controller, a pump, a dialyzer filter, a lumen, and an interface to a body-worn monitor. A patient attaches to the dialysis machine through the lumen, and wears a body-worn monitor for continuously measuring blood pressure. The monitor includes an optical system for measuring an optical waveform, an electrical system for measuring an electrical waveform, and a processing component for determining a transit time between the optical and electrical waveforms and then calculating a blood pressure value from the transit time. The body-worn monitor features an interface (e.g. a wired serial interface, or a wireless interface) to transmit the blood pressure value to the controller within the hemodialysis machine.

Abstract: An ozone delivery system for delivering and manufacturing a measured amount of an ozone/oxygen admixture, which is able to measure, control, report and differentiate between delivered-ozone and absorbed-dose of ozone. Improved gas-fluid contacting devices that maximize gas-fluid mass transfer may be included. All gas contacting surfaces of the system, including one or more gas-fluid contacting devices are made from ozone-inert construction materials that generally do not absorb ozone or introduce amounts of contaminants or deleterious byproducts of oxidation into a fluid or non-fluid target from ozone oxidation.

Abstract: A proposed blood treatment apparatus includes: a blood treatment unit, a pair of fluid pumps and a pair blood pumps. The blood treatment unit is configured to receive untreated blood and fresh blood treatment fluid, and emit treated blood and used blood treatment fluid. The fluid pumps are configured to pass blood treatment fluid through the blood treatment unit. The blood pumps are configured to extract untreated blood from a blood source, pass extracted blood through the blood treatment unit and deliver treated blood to a target vessel. Additionally, the fluid pumps are configured to control the operation of the blood pumps via the blood treatment fluid. Moreover, a flow control device is configured to control a trans-membrane flow between the blood side and the a fluid side of the blood treatment unit. Hence, for instance ultrafiltration can be adjusted to a desired level in a very straightforward manner.

Abstract: Apparatus for managing a residential wastewater treatment system includes an in situ control unit that monitors an individual system. The control unit provides local control and alarms, and also sends status reports and/or alarms to a remote monitoring center via a telemetry device. The remote monitoring center makes information concerning the individual system available through a website.

Abstract: A method and device is provided for collecting filterable material to perform assays on a filtration apparatus by applying negative-pressure to the inlet chamber of the filtration apparatus which is independent of negative or positive pressure applied to its fluid path. The negative-pressure applied to the inlet chamber serves to actively aspirate fluid and promote flow into the inlet chamber via the fluid pathway. The negative-pressure applied to the inlet chamber facilitates the use of either negative or positive-pressure based fluid-filtration approaches. Use of the invention improves the functionality and scope of applications that can be performed with enclosed filtration apparatuses.

Abstract: The disclosed process and system are used for the denitrification of wastewater. The system comprises: an influent concentration analyzer for measuring an influent dissolved oxygen concentration, an influent nitrate concentration, and an influent nitrite concentration; and a feed chemical controller for providing a feed chemical at a controlled rate.

Abstract: A water filter with a sterilizing function has a filtering device, a sterilizing device and a pipe connecting the filtering device and the sterilizing device. The filtering device has a water inlet and a water outlet. The water inlet is connected with a water supplying pipe for receiving water. The sterilizing device has an inlet and an outlet. The outlet is connected with an output pipe for providing water. The inlet is connected to the water outlet of the filtering device. The water flows through the filtering device and the sterilizing device as it goes through the water filter. Therefore, chemical materials and bacteria in the drinking water are removed.

Abstract: The invention relates to a water treatment device for a passenger aircraft including a water inlet port, a water outlet port, a pipe for connecting the water inlet port to the water outlet port, a filtration device located in the pipe and an electronic control device, wherein the electronic control device is adapted to monitor at least one parameter associated with the status of the filtration device: volume of water flowing through the filtration device on the basis of a corresponding measuring signal; time period after a filter exchange in the filtration device; and/or pressure loss over the filtration device on the basis of a corresponding measuring signal; and, if the monitored parameter fulfils certain criteria, to determine a filter exchange request and to output a filter exchange signal.

Abstract: A faucet mounted water filtration system includes a base having an inlet, a water receiving chamber, and at least one outlet. The inlet is configured to be coupled to a faucet. A body is coupled to the base. The body includes a filter compartment configured to house a filter cartridge. A cover is rotatably coupled to the body. A cam is operatively coupled to the cover. A valve operatively engages a surface of the cam. The cam is rotatable to move the valve to open and close a passageway to the filter compartment. A biasing element biases the cover to a default position.

Abstract: An interactive sanitizer controller/display pad and method for controlling and selecting a dispensing rate in a sanitizer dispensing system based on the time the system is in a periodic dispensing mode and for indicating when a sanitizing dispenser needs replacement.

Abstract: A system for fluid treatment that provides alternative regeneration cycles within the same fluid treatment device. A second alternative regeneration cycle is available within the same device, which has independent cycles or processes from the first regeneration cycle. The first and second regeneration cycles can be programmed at the same time and be programmed to alternatively run based upon the number of individual cycles run, the time the cycles have run, the amount of fluid that has passed through the device, or the concentration of brine and/or chlorine in the fluid within the device.

Abstract: A control apparatus for a liquid dispense system having at least one liquid outlet and at least one flow control device for controlling the dispense of liquid from said outlet(s) during a dispense operation, said control apparatus including an operating device for controlling the operation of at least one flow control device to permit dispense of a desired volume of liquid from the outlet(s) during a dispense operation; a recording device for recording one or more parameters of the liquid dispense system and/or the operating device during the dispense operation to create a dispense profile for the dispense operation, at least one of the recorded parameters being indicative of the flow rate of liquid at the outlet(s); and a control device for controlling the operation of the operating device during a subsequent dispense operation based upon the recorded dispense profile.

Abstract: A water treatment system (“WTS”) includes a prefilter, a carbon block filter and a microbiological interception (“MI”) filter that operate in combination to treat a fluid stream, such as water. The WTS may include two prefilters, for example, both a multi-layer nonwoven prefilter and a pleated fabric prefilter. The MI filter may include carbon particles and a binder, and the carbon particles may have a mean particle diameter ranging from about 60 microns to about 80 microns and with a particle size distribution in which no more than about 10% by weight of the particles are larger than about 140 mesh and no more than about 10% by weight are smaller than about 500 mesh. In one embodiment, the water treatment system further includes a volumetric end-of-life filter monitor that monitors the life of the MI filter.

Abstract: A method of sensing water within a fuel-water separator assembly disposed within a fuel system of an internal combustion engine is provided. The method includes the steps of: A) monitoring a single selectively activatable sensor within the fuel-water separator assembly to detect the presence of water; B) determining if the sensor is activated for greater than or equal to a first predetermined percentage of time, but less than or equal to a second predetermined percentage of time and providing a first level of warning if true; and C) determining if the sensor is activated for greater than the second predetermined percentage of time and providing a second level of warning if true. An apparatus configured to perform the claimed method is also disclosed.

Abstract: A system and method of desalinating brackish water from an inland, underground water supply is disclosed. The system includes a source of underground water, at least one distillation and/or non-distillation desalination stage, and a source of waste heat from a power generator. The method includes desalinating brackish water drawn from an underground source using waste heat from a power generator and one or more non-distillation and/or distillation desalination stages. Potable water is recovered from both the brackish underground water using waste heat from the power generator, while dissolved salts are taken to dryness and removed as solids and from the flue gases.

Abstract: This invention provides a method and apparatus for a hemodiafiltration delivery module that is used in conjunction with a UF controlled dialysis machine to enable hemodiafiltration therapy to be performed. The advantage is that one can fully utilize a current functioning dialysis machine to perform a hemodiafiltration therapy as opposed to purchasing a completely new machine that offers this capability.

Abstract: The present invention is an apparatus and process for cleaning substrates using dense fluids under the influence of centrifugal force and dense fluid phase changes. A perforated centrifuge drum operates within a pressure vessel having drains and fill ports. System controls include a high optical sensor, a low optical sensor, a pressure transducer, and a thermocouple. An external dense fluid cleaning and management system exchanges dense fluid and gas with the pressure vessel via the drain and fill ports. Dense fluid centrifugal separations prevent pooling and supercooling of liquid carbon dioxide avoiding recontamination of the substrate. The present invention can perform solvent-aided separation processes including liquid-liquid, liquid-supercritical-fluid, froth flotation and centrifugal phase-shift separations.

Abstract: A system (11) for providing purified water comprises a plurality of individual modules, each of which includes a separable head (13) and a canister (17), which modules are joined one to another via these heads to create a composite manifold (15). The heads and canisters are respectively of substantially identical construction, and the hollow canisters include the following units: preheater, prefilter (25), pump (27), membrane purification (29), postfilter (31), and UV treatment. The overall system is monitored by a control unit (131) that is regularly interrogated by an off-site, headquarters computer, and both the control unit (131) and the headquarters computer are proactive in detecting potential difficulties that may be able to be readily remedied by promptly dispatching a serviceperson with a replacement for the canister containing the operating unit that requires replacement.

Abstract: The present invention provides a method and system of anticipating salt depletion in a brine tank of a water softener system, the system including a controller having a user interface and display, the method comprising the steps of tracking salt usage; determining the amount of salt remaining in the brine tank; calculating the number of days before salt is required in the brine tank based on salt usage and the amount of salt remaining in the brine tank; and providing an indication of the number of days to empty, whereby a user is able to anticipate the need to replenish the salt supply and plan accordingly to assure continuous satisfactory operation of the water softener system.

Abstract: A method for improving the permeate flux of a cross-flow membrane filter having at least two membrane ports through which the feed solution passes and at least two permeate outlets. The method includes the steps of establishing a first flow of a feed solution in a first direction through the membrane ports of the cross-flow membrane filter; reversing the first flow after a predetermined time to a second flow direction opposite that of the first flow direction; and repeating steps (a) and (b) until the permeate flux through the cross flow membrane filter reaches an unacceptable level by using a feed pump and a valve manifold assembly located between the feed pump and the cross flow membrane filter for selectively reversing the flow of the feed solution through the membrane ports of the cross flow membrane filter.

Abstract: A water filtering system for a refrigerator determines a need for a filter change by timing the period of actuation of at least one valve used to regulate the flow of filtered water to both a water dispenser and an ice maker. Based on a known flow rate, a volume of filtered water associated with the duration of valve actuation is calculated. A summing device determines an accumulated, filtered water volume. When the accumulated, filtered water volume reaches or exceeds a threshold value, an indicator is used to signal that the water filter needs to be replaced. As water filtering system of the invention is capable of being operated without a water filter in place, a switch assembly is incorporated to sense the presence of the water filter and the system only senses the valve actuation time when the filter is in place. In addition, provisions are made to reset the accumulated, filtered water volume upon replacement of the water filter.

Abstract: A method of purifying impure water to provide drinking water using an apparatus, the method comprising the steps of providing a microfiltration unit, a reverse osmosis unit and a CIP (clean-in-place) tank containing retentate interconnected to permit backflushing the microfiltration filter with retentate and continued or uninterrupted operation of the reverse osmosis unit by directing retentate thereto.

Abstract: A modular water treatment and purification system, suitable for home use, is connected to a water supply and contains a closed fluid treatment circuit extending to a water outlet. The closed fluid circuit flows through a plurality of replaceable water treatment modules each having a specific water treatment function, such as the removal of a particular material from the water by the use of filtration, carbon adsorption, ion exchange or the addition of a chemical to balance the desired water conditions. Preferably the circuit also includes traversing a radiation device, for example an ultra violet light, for the purpose of sanitizing the water.

Abstract: A water filter system having a housing for a plurality of serial-flow connected filter cartridges with distinct filtering characteristic related to the direction of flow of water being filtered. Each filter cartridge has a membrane wrapped activated carbon filter body. One of the filter bodies includes a heavy metal bacteriostat. The cartridges are each releasably retained in a manifold by keyed connectors including rotatable locking rings. Each cartridge having a distinct filtering characteristic includes a keying structure to ensure that the cartridge can only be connected to the manifold for placement in proper serial-flow relationship in the system. The filter system includes a spent filter cartridge indicator. The filter system is particularly suited for countertop placement and connection to a faucet.

Abstract: A water treatment system having dosing control for providing treated water having very low organic and ionic contamination, that can be accurately dispensed. The water treatment system having dosing control includes a water inlet hydraulically connected to a pump having a variable speed motor. At least one water treatment device is hydraulically connected downstream of the pump, at least one outlet valve is hydraulically connected downstream of the water treatment unit, and a recirculation line is hydraulically connected from the outlet valve to the pump. The output of the pump is controlled by a regulating device connected to the variable speed motor. The system provides for lower electrical current usage and reduced acoustical disturbances.

Abstract: The invention pertains to a process for the production of pure water, in which raw water, or feed water similarly, is fed to a treatment apparatus (1) that has at least one semi-permeable membrane (4), in conjunction with which a partial quantity of the raw water passes through the membrane (4) as pure water under the driving force of a pressure differential, and the remaining quantity of raw water that flows past the membrane leaves the treatment apparatus (1) as concentrate. In order to counteract any excessive soiling of the membrane (4), and to attain the longest possible operational and membrane service lifetimes, it is provided that the direction of flow of the raw water past the membrane (4) is reversed at intervals of time. The invention also pertains to a treatment apparatus (1) for the production of pure water, with at least one semi-permeable membrane (4).

Abstract: A demand initiated method for regenerating a water softener which operates the softener ion exchange bed over a capacity range in which the resin is most efficiently restored by exposure to brine. The reserve capacity of the softener is adjusted in response to the amount of softening capacity used since the last regeneration, as is the quantity of saturated brine to be used for the next regeneration, which is scheduled when the reserve capacity is exceeded, or the remaining available capacity will not be adequate for normal usage on the next day of the week.

Abstract: In a dialysis apparatus having a dialyzer and a single balance chamber, the internal volume of the balance chamber is preferably at most 2/3 of the volume of the dialysis fluid chamber within the dialyzer. As a result, during the dialysis fluid recirculation cycle, at most 2/3 of the volume of fluid within the dialysis fluid chamber will be replaced by fresh dialysis fluid. Preferably, the duration of the recirculation cycle is approximately equal to the duration of the balance chamber filling cycle.

Abstract: An automatic system to precisely maintain bactericidal action in a reservoir of water equipped with a recirculation system, such as a swimming pool, decorative fountain, spa, cooling water reservoir or the like. The automatic system includes: a service loop which bypasses a portion of the recirculating water past sensors which measure the pH and oxygen reduction potential (ORP) of the water and in which acid and halogen are injected by a chemical feed unit; an electronics unit for determining the injection quantity of the acid and/or halogen needed to restore pH and ORP to stored set-points, and for controlling the chemical feed unit in response to the injection time determination; and an optional telecommunication unit for reporting process control status to a remote location and allowing modification of the process parameters, selection of operating modes, and performance of diagnostic tests from the remote location.

Abstract: A method system for treating water in which the incoming effluent water is pre-filtered, passed through a reverse osmosis unit, post filtered to remove taste and odor and then passed to a holding tank. The holding tank is provided with a source of ultraviolet light to provide disinfection in the holding tank to eliminate bacterial growth prior to consumption of the water therein.

Abstract: Methods and systems of the prior art for cleansing a plurality of seriate filter cells in automatic backwash filters by backwashing the cells one at a time with backwash liquid wherein the cleansing operation on the active cell is prevented from moving to a further cell until the contaminant content of the waste liquid issuing from the previous cell reaches a predetermined low level are improved by overriding such prevention even though such content remains too high when a prescribed quantity of waste liquid has issued from the previous cell, e.g., as determined by a timer or fluid meter.

Abstract: A filter assembly for fluids such as air and water employs a cleanable filter. The filter is located within a housing having a reservoir, and a steam generator which can be selectively operated to clean the filter.

Abstract: Water treatment apparatus includes a housing, and at least one canister disposed within the housing. Inside the canister are disposed a first water treatment material and a second water treatment material, the first material being different from the second material. Both the first material and the second material acting alone makes the contaminated water more suitable for human consumption. Preferably, the first material is disposed in a first stage, the second material is disposed in a second stage which is physically discrete from the first stage. Alternatively, the first material and the second material may be admixed together in the canister. The apparatus preferably includes an alarm for indicating when the material for treating the contaminated water needs to be replaced.

Abstract: An under-sink type water purifier with a water-tap portion connected to a purified-water outlet of the purifier having a sensor for sensing an object to issue a signal, and a solenoid valve for starting and stopping the discharge of purified water from the water-tap portion in response to the signal. The apparatus is characterized by a control circuit for opening and closing the valve in response to the signal. The circuit is provided with at least one of a first timer for opening the valve at every preset time for a short time, and a second timer for opening the valve for a short time to permit the water-tap portion to discharge the purified water therefrom when the purified water remains confined in the purifier for a predetermined period of time. These timers are selectively used in operation.

Abstract: In relation to time intervals or pressure loss, the successive flushing via the same flushing channel (10) of several filter elements (7) is brought about by the direct sweeping of the internal surface of said elements (7) by the fluid to be filtered. It comprises a tubular body (1) and an upstream distribution plate (4), each feeding a filter element (7) extending axially inside the body, and a downstream aperture. At its downstream end there is a distributor comprising several inlets linked to the downstream end of the elements (7), said inlets being linked by channels (22) to a single outlet, itself linked to a flushing branch pipe (8) opening laterally outside the body (1). This distributor comprises a rotor (18) which, depending on its angular position, separately connects each of its inlets to the shared outlet of distributor.

Abstract: A rotary machine having a machine body and a cover covering an opening of the body. The cover is fixed to the body by an improved vibration-absorbent structure. A peripheral edge of the cover which is adjacent to the body has plate-spring-shaped mounting brackets whose distal ends project from the edge. The end of the machine body which is adjacent to the cover has mounting portions that are grooves or holes. The bracket distal ends are inserted into the mounting portions through rubber vibration insulating members. With the structure, the cover is assembled at improved efficiency and is restrained from vibration.

Abstract: The present invention is an apparatus and method for filtering particulate matter from dielectric fluids, and for maintaining and monitoring of the purity of said fluids. The invention operates by imparting an electrostatic charge, via a pair of convoluted perforated oppositely charged electrodes, to the particulate contaminates contained in the fluid. The positive electrodes and negative electrodes are each unitary and in combination with a filter media form a unitary cartridge which is removable and replaceable within the apparatus. A microcontroller may be provided to monitor, analyze and report certain parameters of the fluid to be filtered.

Abstract: An apparatus for automatically treating a drain system to prevent or at least minimize clogging problems particularly in grease traps of the type provided in restaurants and other food preparation establishments. The apparatus includes a valve for directing fresh water into the grease trap for pretreating the trap in preparation for the injection of bioactive liquid cultures by the pump. The liquid cultures liquify and digest contaminants in the grease trap which are flushed therefrom by fresh water. The apparatus is controlled by a system which cyclically operates the apparatus in accordance with a preferred operational sequence and at adjustably variable time periods.

Abstract: A process for automatically treating a drain system to prevent or at least minimize clogging problems particularly in grease traps of the type provided in restaurants and other food preparation establishments. The process employs an apparatus which includes a valve for directing fresh water into the grease trap for pretreating the trap in preparation for the injection of bioactive liquid cultures by the pump. The liquid cultures liquify and digest contaminants in the grease trap which are flushed therefrom by fresh water. The apparatus is controlled by a system which cyclically operates the apparatus in accordance with a preferred operational sequence and at adjustably variable time periods.

Abstract: A protective cover assembly for a fluid end of a plunger-type pump or other positive displacement pump. The protective cover assembly includes a cover adapted to fit in an open end of the fluid end of the pump. The cover comprises a convex or domed center portion adapted for buckling away from a plunger of the pump when pressure in the pump exceeds a predetermined level and further comprises an outer portion. A cover retainer is engageable with the open end of the fluid end of the pump and is adapted for clamping the outer portion of the cover to the fluid end. A seal is provided between the outer portion of the cover and the fluid end. The convex center portion of the cover has a convex surface generally facing the plunger, and the convex surface is preferably hemispherical.

Abstract: An improved control for a resin bed water softener includes a microcomputer which is supplied with input data from a flowmeter indicative of the quantity of soft water leaving the softener. In accordance with the flow data, the microcomputer determines the amount of water used since the last regeneration and also determines the average daily soft water consumption. The microcomputer also coupled to a data input device and receives input data indicative of the total resin bed treating capacity and the incoming water hardness. At a prescribed hour each day, the microcomputer determines the remaining water softener resin bed treating capacity as calculated from the water hardness, the total resin bed treating capacity and the amount of water used since the last regeneration.

Abstract: An improved control for a particle bed water treatment device includes a microcomputer which is supplied with input data from a flowmeter indicative of the quantity of treated water leaving the water treatment device. In accordance with the flow data, the microcomputer determines the amount of water used since the last regeneration and also determines the average daily treated water consumption. The microcomputer is also coupled to a data input device and receives input data indicative of the total particle bed treating capacity resulting in complete particle bed exhaustion. To recognize and account for the additional particle bed capacity that is created when a partially exhausted particle bed is regenerated, the microcomputer advantageously adjusts the total treating bed capacity value received from the data input device in accordance with the remaining particle capacity existing prior to regeneration.

Abstract: An improved control for a water softener includes a resin bed sensor for sensing when the resin bed has been depleted to a predetermined percentage of the total resin bed treating capacity. The resin bed sensor is connected to a microcomputer which is also coupled to a flow meter to receive data therefrom indicative of the quantity of treated water leaving the water treatment device over a given period of time. When the resin bed sensor signals the microcomputer that the resin bed has been depleted to the predetermined capacity the microcomputer calculates the total softening capacity of the resin bed. Each day, the microcomputer computes both the total quantity of treated water consumed since the last regeneration and the remaining capacity of the resin bed. The microcomputer also maintains a record in memory of the previous 7 days' usage and the average usage is calculated to establish a soft water reserve value.

Abstract: An improved control for a resin bed water softener includes a microcomputer which is supplied with input data from a flowmeter indicative of the quantity of soft water leaving the softener. In accordance with the flow data, the microcomputer determines the amount of water used since the last regeneration and also determines the average daily soft water consumption. The microcomputer also coupled to a data input device and receives input data indicative of the total resin bed treating capacity and the incoming water hardness. At a prescribed hour each day, the microcomputer determines the remaining water softener resin bed treating capacity as calculated from the water hardness, the total resin bed treating capacity and the amount of water used since the last regeneration.

Abstract: Ion exchange medium in a water softening system is regenerated cyclically, in response to both a preset timer and a metering device responsive to the degree of hardness of the untreated water and the degree of exhaustion of the ion exchange medium, by slowly feeding regenerating medium, prepared during the softening phase by the metering device, counter current to flow during softening at a rate so as not to disturb the exchange medium and to prevent substantial mixing of the regenerating medium with the water being displaced.

Abstract: This invention relates to a control system for regeneration of a water treatment system in which a water meter monitors water usage and mechanically drives a water volume wheel to an operative position to call for regeneration when a predetermined volume of water has been treated and then automatically resets itself. A timer wheel driven by a motor is included within the control system such that the timer wheel and the water volume wheel coact to activate the regeneration cycle mechanism at a predetermined time after a predetermined volume of water has passed through the water meter. The mechanism is adjustable relative to the water treating capacity of the treatment system and the condition of the water being treated so as to be able to vary the predetermined volume of water treated which will call for regeneration.