flow through the sump

[digital-audiophile]

The way I roughly calculate mine is that with my Rio 32HP pump rated at 1300GPH at 6' head I have it throttled back to about 1/4 open via ball valves (~325GPH) with 90 gallons in the display tank I figure this entire volume should in theory pass through the pump 3+ times an hour. I have a 55G sump with ~30G of water in it, I did not take this volume into consideration, allthough perhaps I should.