Features: 310 mm wide spillway Easy liner attachment, clamps between spillway & housing (with sealant against the housing) A choice of 4 water entry points, front, back & each side. 40 mm bulkhead fitting/hose tail supplied. Large bio-media mesh bag supplied (recommended media is scoria) Ridged design, will not crush or distort. The swirl chamber creates an even flow through the bio-media and the round media compartment prevents water from tracking around the sides of the media. When combined with good pre-filtration such as the Aquatic Lifestyles Skimmer this bio-filter only needs cleaning once per year. This means the beneficial bacteria is not being upset every time filters are cleaned which is a problem with combined bio/mechanical filters and the cleaning can be done at the end of Winter when the pond is still dormant. New Zealand Made Dimensions: 430mm W x 450mm H Spillway Width: 310mm Pump Flow Rate: 3,500 LPH to 16,000 LPH Pond Size: 1,000 to 10,000 litres