"sbryan" wrote in message
...
My rule of thumb is that the pump should be capable of turning the pond
capacity at least once per hour. More is better. I had a 90 gallon pond
with a 5-gallon homemade "Skippy" fed by a 300 gallon per hour pump that
worked great for years. I now have an 1800 gallon pond with a 2400 gallon
per hour pump operating a Savio waterfall with skimmer and all is well for
two years now.

Bryan
Dallas, TX

Yes, water changes at least once an hour, so I assume ALL the water goes
thru the biofilter, none bypasses and goes straight to the pond from pump.
Thinking of two 100 gal. Rubbermaid stock tubs as the bio. One stepped
down from the first, gravity flow. Seems as tho asking a lot of gravity,
thru 4" PVC connectors. The pump I'm looking at is a Sequence 750 series,
4200 with leaf basket, 2800gph with the head I'll have.