Edited my post above. I shouldn't type and play with the kids at the park!
The key is how much UV exposure you hit the dinos with which is a function of speed through the unit and bulb strength. For example: if you had a 240w unit, you could run a feed pump at 2400gph and achieve
90,000µw/cm²(EOL).
You want at least 90,000µw/cm²(EOL) to kill dinos IME. BRS said there is some evidence you need even higher exposure.
Here is a link to aquaUV exposure chart. note that this is ONLY for aquaUV units and you can't apply the same to other units.
The key is how much UV exposure you hit the dinos with which is a function of speed through the unit and bulb strength. For example: if you had a 240w unit, you could run a feed pump at 2400gph and achieve
90,000µw/cm²(EOL).
You want at least 90,000µw/cm²(EOL) to kill dinos IME. BRS said there is some evidence you need even higher exposure.
Here is a link to aquaUV exposure chart. note that this is ONLY for aquaUV units and you can't apply the same to other units.