There is other methods that are certianly cheaper. Plant it heavy
enough and the plants will pull out a lot of nutrients algae uses. UIV
works very well but its a never ending means that has to be figured
into the overall cost of pond mainteneance when you need to replace
the UV bulb some of which are quite pricey. However you can use UVC to
cklear up the water quicker, then allow plants etc to continue on with
pulling nutrients out of the water.....no need to run it all the time
once yur water is cleared up. Lots of poeple do just that, use UV to
get a head start on algae control and then turn it off. Perhaps
adding some shade will help as well and if you have fish not
overfeeding them will also cut back on nutrient levels.

You could also add a veggie filter upstream.....Pressure filters are
ok, but I htink for $700 you can do much better. Look at a HOzelock
system with the Bio Force units.....they are a pressure filter, with
UV and do a great job and at a lesser cost if you shop around. Check
out AZPonds.com for best prices if your in the USA....



On Sun, 29 Apr 2007 18:53:28 -0400, "Promextheus Xex"
wrote:

Hi,

I was thinking of getting a pressure filter with a built-in UV for a pond
that's near 4000 gals. I have a small pond off to the side that's about 60"
dia and 18" deep. I usually grow some plants in that and the water flows
from there into the main pond via a small stream.

The pressure filter is about $700. I want to try to control the greenness
this year. Are they good and worth it?

Here are a couple that I was looking at:

http://www.petsandponds.com/securestore/c237479.2.html
http://www.petsandponds.com/securest...6504903.2.html

- Prometheus Xex




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I forgot more about ponds and koi than I'll ever know!