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We use a UV light in the flow of the water to sterilize the water and keep our kio pond water clear. We still get surface alga that the fish and the zillion tadpoles are munching on. The fish eat the tadpoles and get fat.
I don't know if UV lights are useful for a pool or not. It works great on our pond.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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