Patent ID: 7135436
Filing Date: 2006-11-14
Classification: C02F

Abstract:
1. A molded, solid, water-soluble composition for contact with water being recirculated to control algae in said water, said composition comprising on a 100 weight percent total weight basis: (a) from about 1 to about 55 weight percent of terbuthylazine, and (b) from about 45 to about 99 weight percent of water-soluble polyethylene glycol polymer that is a solid under ambient conditions and that melts at a temperature above about 100° F., said terbuthylazine being dispersed in said polyethylene glycol polymer when melted followed by molding and solidifying of the resulting dispersion in at least one mold whereby, when a surface portion of said so molded and solidified composition is contacted with water, said terbuthylazine is gradually delivered into said water by surface dissolution of said composition.