This set contains two Laguna pressure filters which means that this filter system perfect for bigger ponds, particularly those with up to 20,000 litrtes of water. The pump supplied can handle solids of up to 8mm and can be conncted to the two filters via a Y-piece/T-piece and connecting hose. These filters can be cleaned without opening the lid! by simply switching to \'waste\' mode and scrubbing the dirty filter sponges via the external handles, causing the dirty water to leave through the special waste outlet (see attached pictures). Also features two 20w UVCs (40w total), filter foams and biospheres in the bottom chamber. This set contains the following components (please click links below for more information): • Laguna Max-Flo 11000 pond pump • 2 x Laguna Pressure-Flo 10000 pressure filters * Saving made when compared to buying items separately.