Keep your large pond both beautiful and healthy using the Pondmaster Clearguard Pressurized Filter with UV Clarifiers. This robust unit provides a convenient solution to complex pond care, thanks to its many features. The pressurized chamber uses mechanical and biological filtration to clean your water, while the enclosed system ensures a convenient set-up. Water enters the piece through its top, 2.5" threaded inlet, and this filter can accommodate water flow from a 9000 gph or smaller pump (not included). Dual, 18 Watt UV Clarifiers sterilize the water as it passes them. Water then travels upward through biological media to turn nitrites and ammonia into nitrates and oxygen, next through the filter pad for polishing, and back into your pond full of beneficial bacteria and nutrients. Seven different settings assist in every facet of filtration. A pressure gauge at the top of the item indicates if it is running well or needs cleaned, and backwash and rinse settings help you eradicate debris in the unit. For in-depth cleaning of the included biological media, use the Large Backwash Air Kit (not included) to push air through the chamber and keep it in good working order. The two, integrated UV clarifiers can also be maintained by using a new Replacement UV Bulb (not included) in each unit, ensuring the full light spectrum is emitted. An 18' long cord on each clarifier powers them, and the black, sturdy plastic construction forms a lasting filter. Help your large waterscape remain healthy with this Clearguard Pressurized Filter with UV Clarifiers. One year limited warranty.