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I had issues w/ green water in my 90g and used a UV sterilizer (9W turbo twist) which cleared it up very quickly.

Later I removed it and the tank was green water-free for many months.

Recently after doing a big re-scape and disturbing the substrate a huge amount green water began to develop again. I have since re-attached the UV sterilizer (in-line) and have decided to run it continually.

I do not believe it kills any other algae than free-floating but it is also supposed to kill free-floating parasite--if you have the flow rate set such that the residence time of the water in the sterilizer is sufficient.

From reading threads here I believe many people run these continually without issue.

Good luck!

-Roy
 

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Premium Member
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Each UV sterilizer model specifies the flow rates needed to kill different things in the water. Larger units can handle higher flows.

I have mine plumbed into my Magnum 350. When I am using the micron filter cartridge the flow rate drops off as the cartidge gets plugged--and the UV light becomes more efficient.
 
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