UV sterilizer install...

[Shaun_in_Cali]

G'day Reefers - I'm looking at installing a UV steriliser to my tank to help with Dinos - I have 2 (received when I purchased the tank, one is definitely 25W and the other I suspect is 15W (Both Gamma). According to this chart: https://x4u6a9v7.stackpathcdn.com/files/GammaUV_SizingGuide.pdf

the 25W appears to be sufficient. My tank size is 120G, and my return pump is returning about 500-550GPH. Reading this chart it would seem that 25W and plumbing direct into my return should be sufficient.

Would there be any benefit to installing both; if so would it be better to plumb in both in series or parallel, and do people have any thoughts as to benefits of plumbing into return line vs returning the water to the sump on a different circuit?

Thanks in advance

 

[Dragon52]

A different line gives you the better option because it allows you replace the UV itself if it ever breaks down without shutting the return off. Also the faster the water goes thru the uv the less it's effective. I'm looking at hard piping mine with pvc & valves to run off my return pump at a slower rate to match the required flow. this will also allow me to increase the flow of my return pump. right now I can't run it any higher than 4 lights. It's a EcoTec M1.