When you make your decision, see if there is some way that you can pass the
water through some sort of mechanical filtration prior to sending the water
to the UV. It will work better that way if you can strain some of the
"solids" out first. When buying a UV, it's the water flow you need to
consider. You have a 4500 gallon pond in full sun; to save the $$$, you
could go with one designed for 4,000 gallons and use your 1700 gph pump. The
water will pass through slowly enough to get a very good "kill" ratio;
however, it may take a bit longer to work than if you purchased a properly
sized UV for the situation (which would be about 2X the size of the pond to
factor in "full sun"). Either way, you should see a significant change in
less than a week.

Hope this helps.

Lee

"Bahnee" wrote in message
om...
After three years of fighting green water, I am throwing up my arms in
defeat and counting my pennies to get a UV sterilizer.

So, what's the dish on these things? I researched a bunch about four
years ago, but perhaps technology has changed. My pond is 4500 gal,
full sun. No string algae....just the suspended tiny stuff. I would
run the unit off a separate pump from my regular filter system...have
a 1700 gph Leader available.

I live in Portland, OR, and there are some places I haven't checked
yet, but hope maybe there are some good $$ deals online. So, if anyone
can provide some source and tech info, it would be appreciated.

Haven't been on rec.ponds for quite some time. I notice Jan is still
here...HI! I'm also wondering if Vern is still reading. If so, how are
those koi I gave you looking?

Oh yeah, one last question. I have been going crazy trying to find
leopard frog tads to introduce....or ANY frogs for that matter.
Someone gave me a bullfrog, but it only hung around about a week. I
have teeny-tiny frog tadpoles of some sort, so I hope they hang here
and serenade. BUT, I'd really like some leopard frogs. Any source
suggestions?

It's good to be back to this group and see how MUCH it has grown.

bahnee