PURGE TANK CLEANER. *Completely REMOVES organic slime from fresh water tanks... the source of recurring bad tastes. *Ensures good tasting water, ice cubes and beverages. *No after taste whatsoever. *Eliminates "rotten egg" smell from hot water heaters. *Quick spot deodorizing of gray and black water tanks. *Very effective on a wide variety of stains and odors. *450g.