UV will kill free floating Algae pretty simplay, a little harder to kill is free floating bacteria and the hardest is parasites. but UV will kill them all if sized properly and you have a slow enough flow rate through the unit.
Is it a cure all, no but it is one more tool we can use to help us.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
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