Patent ID: 6749758
Filing Date: 2004-06-15
Classification: A01N,C02F

Abstract:
A method of enabling uniform control of bromine concentrations in a recreational body of water which has not been treated with an N,Nâ€²-dihalo-5,5-dialkylhydantoin biocidal agent or which does not contain residues resulting from prior addition thereto of an N,Nâ€²-dihalo-5,5-diallcylhydantoin biocidal agent, which method comprises conducting the following steps:A) introducing into said body of water at least one water-soluble source of bromide ion and at least one dialkyihydantoin, in which the alkyl group each contain independently in the range of 1 to about 4 carbon atoms; and then B) introducing into said body of water at least one N,Nâ€²-dihalo-5,5-dialkylhydantoin in which one halogen atom is a bromine atom and the other halogen atom is either a bromine atom or a chlorine atom, and in which one alkyl group is a methyl group and the other alkyl group contains in the range of 1 to about 4 carbon atoms; and C) monitoring the oxidation-reduction potential (ORP) of said water, wherein said bromide ion and said dialkylhydantoin are introduced in step A) to stabilize the ORP of the water in an interval of time which is substantially shorter than the interval of time required to stabilize the ORP of the water without conducting step A)-has been inserted.