Keep your waterscape clean and healthy using the Pondmaster Clearguard Pressurized Filter with UV Clarifier. The innovative design and wealth of features on this unit offer a convenient and lasting solution to complex pond care. The pressurized chamber not only provides both mechanical and biological filtration for your pond water, its integrated UV clarifier will also sterilize it for less green water. The top valve has 7 different positions, for filtering, rinsing, backwashing, or emptying your pond, and the pressure gauge on the top helps indicate if the unit requires any maintenance. Water enters the piece through the top, 1.5" threaded inlet, moved by an 8000 gph or smaller pump (not included), and flows past the 18 Watt UV Clarifier. When it reaches the base of the chamber, it then moves upward through the biological media and a filter pad, and exits back into your pond full of beneficial bacteria. For in-depth cleaning and agitation of the biological media, use the Pondmaster Large Backwash Air Kit (not included) to push air into the unit and keep it in working order. Additionally, changing the bulb in the integrated clarifier yearly with a Pondmaster Replacement UV Bulb (not included) will ensure the full light spectrum is still emitted for the utmost water clarity. The 18' long cord keeps this clarifier powered while offering versatility in placement, and the black, plastic body creates a lasting unit. Help your medium pond remain clear and healthy with this Clearguard Pressurized Filter with UV Clarifier. One year limited warranty.