Eco Labs Gravel and Substrate Cleaner The Eco Labs Gravel and Substrate Cleaner helps clean aquarium substrates without removing them. This conditioner is great for salt and fresh water, and provides rapid and natural sludge and muck removal. 80% faster than bacterial products alone, the conditioner reduces and binds nutrients including phosphates. Features: . Organic and microbial based . Natural & Non-Caustic . Speeds the biological breakdown to degrade harmful organic waste matter . Contains natural cellulosic matter, select biological accelerators and special microbes . To be used with all MICROBE-LIFT bacteria and enzyme products . For substrate which has 1/4 " or more of solids build up, apply 2 tsp. (10 mL.) of MICROBE-LIFT/ Gravel & Substarte Cleaner per 10 gal. (38L.) of tank water . Use as directed every other week until substrate is clean then follow Substrate Maintenance dosage schedule . For substrate with less than 1/4" or more of solids build up, apply 1 tsp. (5 mL.) of MICROBE-LIFT/ Gravel & Substarte Cleaner per 10 gal . Use as directed monthly, if build up exceeds 1/4" follow substrate cleaning dosage schedule Item Specifications: Size: 16 oz