Now the benefits that a pressure filter brings to a pond project can be rolled out to large ponds, koi ponds and high waterfalls: - they can be positioned/buried below the water return area - they can handle high pump flow rates - they are compact The Velda Clear Control 100 pond filter has a cannister capacity of 100 litres - more than twice the nearest competitor.It is also equipped with a seven-position handle switch which means the filter can be simply turned to Clean position andeffectively cleaned/backwashed without removal of the lid. Dirty water then exits via waste outlet.The other position options include: • Back wash valve: This position is used to wash away the dirt in the valve • Pond drain: Used to empty the pond • Filtration: Standard running position. • Medicine position: Water runs back into the pond bypassing the filter media. • Stop: Pump can be cleaned, whereas the water remains inthe filter • Winter: NEW The extra new position is a winter setting which actually drops the water within the container by about 2 inches and in severe winter conditions it prevents damage to the rubber sealing ring. The PondXpert UltraFlow 16000 is a trusty pump that is well-matched with this particular filter, as is the PondXpert Greenstop 40000 55w UVC. * Saving based on price of buying items separately!