Aquascape® UltraKlear® UV Clarifier/Sterilizer Model:UltraKlear® 1000 you need a pump that

you need a pump that produces 5gpm (300gph) at 4' of head

or pool covers

2 ppm Total Hardness 0-200 ppm as CaCO3 4

You can run numerous lights off of one controller

Constructed of structural foam plastic to withstand freeze-thaw cycles

Aquascape® UltraKlear® UV Clarifier/Sterilizer Model:UltraKlear® 1000 you need a pump thatIn a pond, algae blooms or "green water" can be a difficult issue to address safely and effectively. Not anymore! The Aquascape UltraKlear UV Clarifier Sterilizer uses a technologically advanced T5 high output UV bulb, making it more efficient than traditional UV clarifiers. The Aquascape UltraKlear UV Clarifier Sterilizer features a swirl sleeve that helps direct the water around the UV bulb, creating more contact time and increasing UV efficiency up