Patent ID: 7985413

Claim:
A water sanitizer which comprises a dispenser that automatically dispenses a sanitizing chemical into water at a controlled rate, said dispenser containing a charge of at least one 1,3-dibromo-5,5-dialkylhydantoin, in which one of the alkyl groups in the 5-position is a methyl group and in which the other alkyl group in the 5-position has in the range of 1 to 4 carbon atoms, that as charged thereto is in the form of granules free of hydrophobic binder, and devoid of any additive therein conferring binding or hardening action to said granules, which granules have an average crush strength of at least 15 pounds per inch of granule thickness, and an average size in the range of about 40 U.S. standard mesh size to about ⅜-inch, said dispenser being adapted to dispense dissolved biocide species from said at least one 1,3-dibromo-5,5-dialkylhydantoin at a rate that maintains a biocidally effective amount of “free chlorine” in said water.