Atlantic Water Gardens Pond Filter & Waterfall Spillway, 26-Inch Spillway Biological filters remove suspended solids, convert toxic ammonia and nitrites to harmless nitrates and aerate the pond Atlantics FilterFalls are designed to be able to expand filter capacity as ponds age and fish grow Efficient removal of toxins and floating particles from the water column improveswater quality and clarity Oversized chamber contains more media material to start with, accepts additional filtration when needed and accommodates more choices of filtration media Overhanging weir with drip edge eliminates leaking due to silicone seal failure Multiple bulkhead locations allow maximum versatility in plumbing FilterFalls Reinforced body prevents warping and deformation for years of worry-free service Support bars accommodate heavier stone and gravel for ease in camouflaging FilterFalls includes installation kit, male thread adapter and one-piece liner flange