Liquid purification or separation – Processes – Chemical treatment
Patent
1987-08-12
1989-07-11
Wyse, Tom
Liquid purification or separation
Processes
Chemical treatment
210764, 210765, 71 67, 134 2, 134 26, C02F 150
Patent
active
048469793
ABSTRACT:
There is disclosed a chemical algacide composition, and method for its use, to prevent and remove yellow algae deposits in swimming pools, spas and simlar bodies of water. The algacide composition comprises from 5 to about 12.5 weight percent of a soluble polyphosphate and the balance of an alkali metal or ammonium bromide. The successful use of the algacide composition requires the presence of an oxidizer which is effective to convert the bromide to bromine. This conveniently can be the oxidizer which is used in the water, e.g., chlorine or sodium hypochloride in swimming pools and spas, or can be an additionally added oxidizer, such as a persulfate, etc. The method comprises the addition of the algacide composition to the water at a dosage sufficient to provide at least 0.5 ppm of the soluble bromide in the water, and to maintain an active oxidizer in the water.
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