'Veggie' Filter

On Fri, 3 Oct 2003 17:35:24 -0400, "BenignVanilla"
wrote:

I lose circulation, and potentially my main pond would overflow about 1/2-1
inch of water as the bigger VF area drains down into the lower. I used to
have a check valve in place at the in-flow of the VF, but I recently took it
out.

My pump picks up from the filter, fed by the bottom drain and pumps to
the VF.
I drilled a 5/32" hole in the inlet pipe at about a 45 degree angle
to the flow just above the waterline of the VF. Works like a ventura
and allows a bit of air to enter the flow of water while the pump is
running and stops the siphon/backflow when the pump shuts down. I
have 1 1/2" black plastic pipe and 1800gph pump.

Regards,

Hal