UV install opinion

[jonelder68]

And how much the valve is closed, and how much of the flow that restricts. Which Ive always found to not be linear.

All I know with it running how it is I’ve not had any algae issues or even film on the glass. Was cleaning glass 2-3 times a week and now I’m really only cleaning coralline from glass every 2-3 weeks. So by that I’d say it’s doing its job.

I also went with the 40w that’s huge 30ish-40” long for more contact time compared to a shorter one. I’d take a lower wattage one that’s huge compared to a higher powered shorter version.