Laguna ClearFlo Pump and Filter Kits include a pressurized filter with integrated UV sterilizer plus a companion submersible high performance, low energy consumption pump. Covered by a three year manufacturer's warranty, these quality units will provide you with years of enjoyment and ease of maintenance. Contact us with the details of your pond so we can assist you in choosing the right size equipment. Laguna pressurized pond filters include an integrated UV (sterilizer/clarifier) to help eliminate green water algae and keep your pond crystal clear, clean and healthy. These all-in-one filters provide mechanical, *biological and UV sterilization and are designed to work in tandem with a solids handling pump such as Laguna's Max-Flo. *(except model 700 which does not utilize a biological chamber) They also feature a revolutionary patented Backwash-Cleaning System that quickly and easily cleans the surface of the included foam filters without opening the filter. The bio-media where the beneficial bacteria resides is not affected during this process. Backwash cleaning can be done easily and comfortably in a few minutes without opening the lid. This feature ensures that the filters perform at optimal levels and prolongs the time between full maintenance sessions. An easy-view cleaning indicator signals when it's time to perform backwash cleaning.