Patent ID: 7572384

Claim:
A method of removing chemical oxygen demand from water in an aquatic facility, the method comprising: adding to said water in an aquatic facility a composition selected from either of composition 1) or composition 2): 1) a composition comprising: a persulfate donor from about 90 wt. % to about 99.999 wt. %; and from about 0.000 1 wt. % to about 10 wt. % of a transition metal catalyst measured as elemental metal which is in contact with the persulfate donor, or 2) a composition comprising: a free halogen donor from about 50-99 wt. % of the composition; a persulfate donor; and from about 0.000 1 wt. % to about 10 wt. % of a transition metal catalyst measured as elemental metal, wherein said method maintains a transition metal catalyst concentration measured as elemental metal of between about 1 ppb and about 1 ppm in the water; and sustains a persulfate concentration of less than about 2 ppm when mammals are present.