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Reef calculator · reviewed 2026-05-01
Return pump GPH calculator
Most sumped reef systems want roughly 5-10x system turnover delivered after head loss.
rated pump GPH = target delivered GPH / head-loss factor
Return pump rating
950-1,900 GPH
That aims to deliver 475-950 GPH after about 50% plumbing loss.
What this catches
The first-order mismatch: too little capacity, unsafe wattage, weak turnover, missing coverage, or a budget that ignores supplies.
What it cannot catch alone
A single calculator cannot verify every product, livestock choice, chamber fit, vendor listing, or future stocking plan.
Why open the planner
The planner combines this result with equipment categories, budget tier, bioload, and compatibility rules.
Embed this calculator
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