Cloverleaf CL3 4 Bay Koi Pond Filter Ref: CL3/IJ Size 1220 x 1220 x 860mm. Suitable for Koi ponds up to 3,750 gallons (16,875 litres), or Goldfish ponds up to 7,500 gallons (33,750 litres). This 4 Bay unit comprises of a first stage vortex bay, with Bay 2 being fitted with mechanical brushes, Bay 3 acting as a main biological bay with its Japanese Matting, and Bay 4 serving as the secondary and final biological/mechanical stage - incorporating foam and the highly proclaimed aqua rock/alfagrog. Note:- Pipe inlet size 110mm (4") - Outlet 110mm (4"). Price: £1,199.15 (Including VAT at 20%)