I've never used one, and to tell you the truth, I have only experienced Ich in my younger days as a freshwater junkie.
But a UV light is essentially a tube with a strong UV light in it that has water flowing through it, exposing it to the UV light which in turn kills most bacteria (like Ich).
You'd run it full time, only having to replace the bulb every so often.
Maybe someone who has direct marine experience with a uv filter can give you better advice on it though.
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