No clue what my GPH is. Running a reeflo dart external and no idea how to calculate. At the moment I've got the ball valves set in such a way that if I would open them any more the sump starts draining. It's an eshopps R-300 2nd gen sump. I want to say it's rated at 900gph. With 1" overflows rated at 600gph ea, my guess is that I'm running somewhere between 900-1200gph through both returns. The chiller is rated up to 1500gph.
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