LVAC Liquid Aquarium Gravel Vac is an all-natural formula for the removal of fish waste organic pollutants and sludge, It cleans freshwater aquarium gravel and substrate effectively; along with filtration systems tubes hoses plastic plants and protein skimmers, It is safe and easy and 100% chemical free, It contains billions of aerobic heterotrophic bacteria for all natural cleaning, Aquatic, Water treatment and conditioners, Freshwater conditioners, SKU: RYLHC6363