Hozelock Ecocel 4500 Biological Pond Filter Code: 3922 Conventional filtration system. Biological pond filter for ponds up to 4500 litres When used with the Hozelock Cyprio UVC carries the Hozelock Clearwater Guarantee! Water enters the unit via spray head, which is evently distributed over a foam sheet. Solid particles in the water are trapped in a foam sheet. Almost solids free, the water passes through plastic biomedia where beneficial bacteria cleanse pollutants. The amount of biomedia contained in the filter increases in direct proportion to the size of the filter/pond to support a greater number of fish. Purified water then passes up an outlet tube and back into the pond. Viewing hatch to observe the internal operation of the filter, in particular whether any maintenance is needed. Max Litres: 4500ltr Max Fish CM: 157cm LPH: 2250lph Pipe Size: 20-25mm Price: £24.67 (Excluding VAT at 17.5%) Quantity: