Abstract: For water treatment systems it may be desired to feed various chemicals at optimum rates into the system. Improvements over the invention of U.S. Pat. No. 4,519,914 and also to the novel feeder capsules employed are a shown.The rate of feeding depends upon the size and number of small holes which are provided, or the user pokes through the shell of the capsule, and upon the flow rate of the water around it. In some embodiments the capsule is weighted to direct the small holes upward as it rests in quiet water, thereby substantially to halt the flow of chemical; but as the water is sloshed about in use, the chemical is dispensed at a rate proportional to the amount of use.In a so-called "dumbbell" capsule the vertical tendency is aided by a second vented floatation sphere snapped to the first to hold the dispensing holes upward even in a hot tub. It is used in the controlled release of free bromine by the oxidant, sold under the trademark "OXONE".

Abstract: For water-treatment in swimming pools, cooling towers, hot tubs, and other systems, it is desired to feed various chemicals in small quantities but at optimum rates into the system. In several embodiments of the invention the water is recirculated through the system which usually includes a filter. It has been discovered that the chemicals can be fed by enclosing them in generally spherical plastic capsules suggestive of table tennis balls, but about the size of a base ball. The rate of feeding depends upon the size and number of small holes which are provided, or the user pokes through the shell of the capsule, upon the solubility of the chemical, and upon the flow rate of the water through a strainer, skimmer, or other chamber in the system into which the capsule is introduced. The random orientation of the capsule tends to average out variations.

Abstract: For water-treatment in swimming pools, cooling towers, hot tubs, and other systems, it is desired to feed various chemicals in small quantities but at optimum rates into the system. In several embodiments of the invention the water is recirculated through the system which usually includes a filter. It has been discovered that the chemicals can be fed by enclosing them in generally spherical plastic capsules suggestive of table tennis balls, but about the size of a base ball. The rate of feeding depends upon the size and number of small holes which are provided, or the user pokes through the shell of the capsule, upon the solubility of the chemical, and upon the flow rate of the water through a strainer, skimmer, or other chamber in the system into which the capsule is introduced. The random orientation of the capsule tends to average out variations.

Abstract: For water-treatment in swimming pools, cooling towers, hot tubs, and other systems, it is desired to feed various chemicals in small quantities but at optimum rates into the system. In several embodiments of the invention the water is recirculated through the system which usually includes a filter. It has been discovered that the chemicals can be fed by enclosing them in generally spherical plastic capsules suggestive of table tennis balls, but about the size of a base ball. The rate of feeding depends upon the size and number of small holes which are provided, or the user pokes through the shell of the capsule, upon the solubility of the chemical, and upon the flow rate of the water through a strainer, skimmer, or other chamber in the system into which the capsule is introduced. The random orientation of the capsule tends to average out variations.

Abstract: For water treatment in swimming pools, cooling towers, hot tubs, and other systems it is desired to feed various chemicals in small quantities but at optimum rates into the system. In several embodiments of the invention the water is recirculated through the system which usually includes a filter. It has been discovered that the chemicals can be fed by enclosing them in generally spherical plastic capsules suggestive of table-tennis balls, but about the size of a base ball. The rate of feeding depends upon the size and number of small holes which are provided, or the user pokes through the shell of the capsule, upon the solubility of the chemical, and upon the flow rate of the water through a strainer, skimmer, or other chamber in the system into which the capsule is introduced. The random orientation of the capsule tends to average out variations.

Abstract: For water treatment in swimming pools, cooling towers, hot tubs, and other systems it is desired to feed various chemicals in small quantities but at optimum rates into the system. In several embodiments of the invention the water is recirculated through the system which usually includes a filter. It has been discovered that the chemicals can be fed by enclosing them in generally spherical plastic capsules suggestive of table-tennis balls, but about the size of a baseball. The rate of feeding depends upon the size and number of small holes which are provided, or the user pokes through the shell of the capsule, upon the solubility of the chemical, and upon the flow rate of the water through a strainer, skimmer, or other chamber in the system into which the capsule is introduced. The random orientation of the capsule tends to average out variations.

Abstract: A new use of the apparatus for dispensing chemicals such as insecticides and fertilizers by means of a garden hose is disclosed. In earlier applications the use of a spherical feeder capsule in an "intermediate-velocity chamber" was disclosed wherein the spherical shape provided uniformity of feeding by reason of its random movement and rotation in the chamber. In the new use described, the spherical shape may provide a decidedly non-uniform rate of feeding; and there may be a lesser degree of freedom of the feeder within the chamber compared to the earlier-claimed uses. In the preferred embodiment a water supply is connected through a hose to a chamber such as the "Fluidic Lawn Feeder" produced by Acme Burgess Inc. From the chamber a second piece of hose extends to a pistol-grip nozzle of the well-known type whereby an operator may quickly turn the water on and off to the pro-set rate of spray or the like.

Abstract: A filter for the water of swimming pools or the like comprises: a cylindrical body having, coaxially, an inner hollow surface and an outer peripheral surface; a pair of opposed disks that seal the ends of the body; and an axial fitting, that generally is spaced from the hollow surface and that connects the disks; the direction of flow being through the fitting, to the hollow surface, through the body and from the peripheral surface. Preferably, the cylindrical body is formed by the overlapping convolutions of an elastomeric foam sheet and the filter is incorporated in a system that employs a coagulant for enhancing filtration efficiency and a caustic for enabling filter cleansing.

Abstract: A filtration system comprises a relatively thin prefilter medium and a relatively thick main filter medium, which are so related that the pore size of the prefilter medium is no greater than the pore size of the main filter medium. The purpose of the prefilter medium is to prevent premature clogging of the surface of the main filter medium. The arrangement is such that backwashing or replacement of the prefilter medium can be effected readily in order to prolong the life of the main filter medium.

Abstract: A liquid filter comprises an open cell, elastomeric foam body and a dimensionally stable gate. The foam body is formed with a central opening that defines an inlet surface through which a liquid to be filtered enters. The periphery of the foam body defines an outlet surface through which the filtered liquid exits.