The OASE Biosmart 36000 Pond Filter (formerly known as the Biotec 10.1) is a superb, well established mid-range gravity flow through filter for ponds up to 36,000 Litres (approx. 8,000 Gallons)Max. pond volume 36000 litres (no fish); 18000 ltrs (average fish stock e.g. goldfish); 9000 ltrs KoiMechanical and biological removal of debris and organic wasteAchieves a healthy pond eco system with clear, algae-free, oxygen-rich water
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