Methods for water treatment

Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...

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Details

210749, 210754, 210759, 210764, 422265, C02F 156, C02F 176

Patent

active

048805475

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".
In the preferred embodiment, a new composition of alum and low molecular-weight cationic polymeric flocculant is dispensed in a novel sphere, blow-molded with stub wings, which is a safe, effective, and attractive package for the chemicals.

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patent: 4692314 (1987-09-01), Etani

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