Waste-Away is a beneficial bacteria will naturally dissolve the sludge and dirt that accumulates in an aquarium and prevent the build-up of debris when used on a regular basis. Waste-Away is fast acting and specially formulated to remove aquarium gunk, unclog gravel/coral beds, and keep filter pads freely flowing longer.  This results in better water flow, more oxygen and a healthier aquarium environment. Waste-Away should be used on a regular (weekly) basis to keep sludge from acculmulating which can negatively affect fish and corals. Contains no phosphates.