Microbe-Lift Gravel & Substrate Cleaner biologically degrades bottom organic sludge and muck with minimal disturbance, reducing or eliminating the potential harmful gaseous compounds, and helps to clarify your aquarium water at the same time.+ for salt and fresh water aquaria+ provides rapid and natural sludge & muck removal+ 80% faster than bacterial products alone+ reduces and binds nutrients including phosphates+ organic and microbial based+ Natural & Non-CausticYears in development, Microbe-Lift Gravel & Substrate Cleaner speeds the biological breakdown of slow to degrade organic waste matter from aquarium bottoms that may become toxic to fish and plant life. As organic solids accumulate on the aquarium bottom they begin to break down, releasing toxic gases and by -products to the surrounding environment. These gaseous by-products endanger fish, marine life, and plants. Microbe-Lift Gravel & Substrate Cleaner contains natural cellulosic matter, select biological accelerators and sp