~ jan JJsPond.us wrote:
They suspect the reason folks using
pressurized systems often find they need UV to keep the suspend algae under
control is because the frequency of backwashing removes the delicate
heterotrophic bacteria. (Koi Ponds few plants.)

Don't people with fluidized filters also need UV?

One more question for your plants only pond; how do your plants get fed?
Do you add fertilizer of any kind? Are your plants in pea gravel or
dirt? I just added some plants and they're mostly in pea gravel and I
hope they'll grow.

Matt