Abstract: The integrated water treatment control system incorporates control of filtration, heating, chemical treatment and water conditioning; a programmable display shows values of key parameters, operational settings and system status; a user-selectable multi-line, multi-language display panel has menus and submenus; a remote access displays through modems and computers; an in-line computation of water saturation index handles sensor and panel keyboard inputs; and a dynamic probe failure detection system is also included.

Abstract: An improved method of attachment of a pH or p sensor in the recirculation/filtration line for a pool or spa or for forming a T-connection between any two pipes comprises a saddle-clamp modified with an aperture to receive the shank of the sensor with an O-ring and a thinner, harder constricting ring surrounding the O-ring. When the saddle clamp is tightened, the constricting ring forces the O-ring toward the aperture while preventing excessive flattening of the O-ring.

Abstract: An improved water analysis system for pools, spas, and the like. An oxidation-reduction potential (ORP) sensor is disposed in the recirculation/filtration system for developing an electrical signal directly related to the active form of a sanitizer contained in the water. A pH (PH) sensor is similarly disposed for developing an electrical signal directly related to the acidity/basicity level of the water. A first electrical driver is operably connected between the output of the ORP sensor and a first bargraph display for moving the first bargraph display in step increments between upper and lower limits corresponding to "more than necessary" and "less than necessary" levels of sanitizer in the water. A second electrical driver is operably connected between the output of the PH sensor means and a second bargraph display for moving the second bargraph display in step increments between upper and lower limits corresponding to "lower acidity than optimum" and "higher acidity than optimum" levels of water.

Abstract: The disclosed system for controlling the chemical balance of a body of liquid, such as a swimming pool, compares the output of a chemical balance sensor immersed in the liquid with a standard indicative of the desired chemical balance, then dispenses a chemical into the pool to adjust its balance towards the desired balance. A timer limits the duty cycle of the dispenser to a relatively short dispensing interval followed by a longer non-dispensing interval permitting the dispensed chemical to disperse throughout the pool, the sensing and dispensing cycle then being repeated if appropriate. Preferably, there are a plurality of sensors, comparators and dispensers, each dispenser having a timer to limit its duty cycle. Also, preferably an over-range alarm is employed to alert an attendant when the chemical balance of the pool departs from a given range.