ProEco CPF Series Pressurized Pond Filters are ideal for ponds and water gardens up to 4,000 gallons. These quality pressure filters deliver crystal clear water with very low maintenance. All of the CPF filters include an integrated ultraviolet clarifier which flocculates (clumps) any algae so it can be filtered out. The "Easy Clean" feature of these filters makes maintenance a quick and easy process that can be done without getting dirty. The CPF Filters can be installed anywhere around a pond and can be buried right up to the lid of the filters which makes them extremely easy to hide.