TetraPond Waterfall FilterThe TetraPond Waterfall Filter is effective filtration for ponds up to 1,000 gallons. This filter can be added to new or existing pre-form or liner ponds without cutting into the liner. The TetraPond Waterfall Filter provides mechanical filtration and a beautiful waterfall that is easy to install and blend into landscape. Additionaly, this filter comes with a mesh bag that allows for the addition of lava rock (not included) for biological filtration. The rugged construction will provide for years of enjoyment.Get your creativity wet and design a water garder or fish pond that will offer years of tranquil enjoyment. Water features add movement and intrigue to outdoor aquascapes and also provide healthy aeration for fish and fauna. Small or large, a unique water component to your landscape will be a conversation piece for all to enjoy.