CALCIUM HYPOCHLORITE COMPOSITIONS FOR INHIBITING SCALE FORMATION AND A METHOD FOR THEIR USE

摘要

A solid calcium hypochlorite composition contains hydrated calcium hypochlorite and an alkali metal salt of phosphonobutane polycarboxylic acid having an available chlorine concentration of at least 50 pe rcent by weight and a water content of a least 4 percent by weight. It has been found that the use of the novel compositi ons of the present invention can significantly reduce scale formation in dispensers for calcium hypochlorite particularly where water having high total alkalinity is used. The prevention or inhibition of scale formation is accomplished without harmfully af fecting other properties of the pool water such as the pH.