20"H x 18"W x 18"L Waterfall width 18" opening Container Capacity 12 Gallons Maximum pump capacity 5000 GPH Weight 10lbs Extra Wide spillway for greater water aeration Open swirl chamber for even efficient water flow through the filter media 3 Separate filtering actions for super clean water Easily buried in ground to hide canister from sight Extra Lrge Capacity designed to increase biological filtration Clean once a year under normal use.