"Dan" wrote in message
...
My bottom drain empties into a settling/veggie pond and is pumped from
there
into a bio-filter where it falls back into the main pond. The pump intake
from the settling/veggie pond is above the bottom of the main pond so I
never risk emptying the main pond. Over this winter, I had a leak
somewhere
in my underground plumbing and my water level did drop but when it got
below
the intake of the pump, the pump just shut off.

That never occurred to me. I have been thinking the whole time I would have
bottom drain to pump to VF. I guess I could have bottom drain to VF, to pump
back to main pond. Does that make sense? Pump FROM the VF to the main pond
where the BD is?

BV.