UV sterilizer for 75 gal.?

9Ws should be sufficient on a smaller canister filter, but due to the high flow of your FX5, a larger model may be needed.
Yes, they are sensitive. The faster the water flows, the less time the UV rays get to come in contact with water. Therefore, a high flow pump will yield poorer results in terms of allowing water to fully contact the UV for an extended time.

I have used a 9 W turbo twist on occasion with a small maxijet powerhead. That combo worked great (only when I thought it was needed). I now have a XP2 and I can tell you that it would be way too much for the 9 W turbo twist . I don't think it would nessecarily hurt the 9 W turbo twist , but the flow would be too strong to have any effect on the water passing through it.

I just keep the 9 W turbo twist around these days just in case I have a GW breakout or something like that. I haven't actually used it for over a year now. If you are considering a UV, then you might want to go with a bigger one like the 18W turbo twist. Contact time with the light is key, and the 18W is designed for stronger flow.

Go portable:

http://www.plantedtank.net/forums/diy/33922-plumbing-portable-uv-sterilizer.html

Now that is a sweet setup Diablo! I think I am going to build one just like that.

BiscuitSlayer said:

Now that is a sweet setup Diablo! I think I am going to build one just like that.

Click to expand...

It was easy to do, use plenty of teflon tape where the PVV connects to the UV.......DC

I like this one. It can be easily removed and put on.
I hafve one and very happy with it.
Look here at amazon.com:
http://www.amazon.com/Gamma-UV-Ster...4?ie=UTF8&s=home-garden&qid=1197943069&sr=1-4