ShuRex Replacement Sponge Filter Media Pads for VIVOHOME 1580/1840GPH Biological Pond Filter, Compatible with 1580/1840GPH/CPF-2500/ CPF-3500 Pressure Koi Fish Pond FilterBrand: ShuRex Color: Blue Yellow Features: Perfectly designed and fit the 1580 1840GPH Pressure Koi Fish Pond Filter Compatible with VIVOHOME 1580 1840GPH Biological Pond FilterAnd also Compatible with SUNSUN Grech CPF 2500 CPF 3500 Physical Filtration and Biological Filtration: All the sponge filter media pads can Trap most visible debris particles without restricting water flow, and also the sponge filter pads are helpful for the accumulation of