I look at it as tank volume plus sump volume (or.. well .. "volume of water in sump" since a sump isn't run full). So that's more like 10x turnover per hour in your case Danny, although it's probably more like 8-9 times since the sump return is likely putting out less than 900gph at 4'-5' of head pressure.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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