The All Pond Solutions 12000L Koi Pond Filter System is a complete box filtration system, designed to run pond water through a variety of Filter Media and fine & coarse foam to keep your pond looking crystal clear. Filter Operation The filtration system uses a variety of filter media distributed amongst two separate bays allowing you to filter high volumes of water. Each of the 2 bay's has 4 different stages of filtration (see below) The first bay comes complete with four (4) Blue Coarse Filter Foam's, the remaining bay has four (4) Yellow Fine Filter Foam's included. 1) Firstly, the water passes through the filter media bay (stocked with media of your choice) 2) Then the water is guided through high-quality Japanese matting; 3) After matting, the water will flow through the filter foams provided; 4) The last section of each filter bay has additional room for filter media. Please note the filter must be placed on the edge of the pond as the clean water flows straight back into the pond not an outlet pipe This model comes complete with an additional cleaning tool that allows you to rinse through your foams without even removing them from your filter box; Features 1 x Dual Filter Box 2 x Clip-on Lid 2 x Inlet stepped hosetails fits hose size: 20, 25, 32 & 38mm 2 x Outlet Pipes one fitted 70mm and 1 stepped fits 38mm and 50mm Pipe 2 x Waste Pipe per Box (for easy draining of water waste) 1 x Temperature Dial Built into Lid 1 x Water Level Indicator Built into Lid (Ideal for Blockages / Cleaning) 4 x Blue Foams (Coarse Grade Foam) 4 x Yellow Foams (Fine Grade Foam) 4 x Yellow Foams (Fine Grade Foam)