John there is a place out east
Call
River roads koi farm
Tell them you know
Me there a close friends they have every thing you need
Plus the shop is amazing
All long island raised koi
LMAO @ both of those comments. How big of a uv do you need? I'm not even close to an expert on those things. I know someone who had a pretty big one I'll try to think of who.
I have a tarpon sand filter never had trouble with it. Takes care of your UV problem since algae wont be able to filter through easily.
Used on my 10k gallon pond the past 4 years.