Water Clear Tank Buddies,#149; Clears cloudy, discolored water and removes odors caused by decayed organics. #149; Neutralizes iron in tap water which causes stains on aquarium glass, hoods, lights, ornaments and accessories. ,Quickly clears cloudy or hazy water conditions caused by fish wastes, uneaten fish food, decaying plants and dead algae. Also neutralizes iron in tap water which causes stains on aquarium glass, hoods, lights, ornaments and accessories for established tan,Details: Remove carbon filter during use. Water may turn dark purple when first added, but will clear within a few hours. Treatment can be repeated after 48 hours and a 25% water change. If using any other water conditioners or treatments, wait 48 hours b,20 tabs,1 tab/10 U.S. gal. (40 L),200 U.S. gal. (750 L) - UPC: 47002617669