LITTLE SISTER 2000 FILTER LITTLE SISTER 2000 FILTER $432.50 SKU: LPP41 QTY: Click here to save 5% off of your order! LITTLE SISTER 2000 FILTER This biological filter is ideal for ponds up to 1000 gallons, and will process up to 800 gallons per hour.  It incorporates a two stage filter system. First the water comes in the built-in pre-filter from a spray bar. The water travels through filter brushes, then continues through a down flow bio-filter. The clean water moves up through a stand pipe and is returned to the pond. The Little Sister can be effectively landscaped into most garden settings. A heavy duty plastic lid for the unit and all internal plumbing are included. Measures 33L x 19.5 W x 18 H. Max flow 800 gph. 3/4 barb inlet. 1-1/2 FPT outlet.