The UV sterilizer that has worked best for me is a Lifeguard 40w. I have the 18w Turbotwist but it doesn't seem nearly as efficient. Best for a smaller tank (50g vs 100g with 40w) Bigger is better  Slow flow is also good to give the UV light more kill time. I use Kent's Liquid Reactor so I can't comment on Calc Reactors.
Anthony
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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