daveydoodle;3987319; said:
So a 150 gallon tank, 40 gallon sump @ 1200 gph over flow/return; 20-25 watt UV Sterilizer?
Connected after the return pump from the sump and before the return to the tank? Or better in the sump itself?
There are two main things to consider when considering a UV light...
A) Flow rate per Watt passing in front of the bulb...
B) times per hour the full tanks volume passes in front of the bulb...
A 20~25W light with 200~250 gallons per hour passing through it set up on a 150 gal tank + 4 gal sump will work great for curing green water, kill parasites and all other potential benefits a UV has to offer...
Pushing 1200 gph through a 20~25W light will not kill parasites and will probably not kill anything other than free floating algae / green water.
In my opinion using a 20~25W UV @ 1200 gph on a 190 gal system is not a good application of UV. This will only be effective against green water and you could use a much smaller UV at a lower flow rate to cure green water... or you could push much less water through the 20~25W UV to get much result than only killing green water.
A 20~25W UV at 1200 gph would be efficient to kill greenwater on a 1,000 ~1,500 gallon pond that gets direct sunlight... so it's a waste of money using that strong of a light to rid a 190 gal aquarium of green water...
A 20~25W UV is efficient to rid a 190 gal system of parasites if run at 200~250 gph. Thus running it at 1200 gph is drastically lowering it's potential.