Pool Turnover Rate Calculator

Inputs

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Total water volume. Rectangular: L × W × average depth.
L
Hours for one full volume through the filter. 6–8 h is common residential practice; spas and public pools run much faster per code.
h
Delivered flow of the pump you have (at the system head, not the open-flow rating) — for the actual-turnover check.
L/min

Results

Default result
Edit inputs
Required pump flow(Q_req)
125L/min
Pass

Volume ÷ target turnover — the minimum delivered flow.

Also computed

Actual turnoverPass6.667h

Meets the target turnover.

What the entered pump really achieves.

Turnovers per day3

Daily filtered volume180,000L

At the required flow, running 24 h.

Method notes 4 notes
  • Turnover arithmetic only: flow = volume ÷ time. The target itself is practice/code — 6–8 h common residential, public pools and spas per the local health code (often 6 h, spas far less).
  • Use the pump's DELIVERED flow at the real system head (filter, heater, plumbing losses), not the open-flow rating — the pipe-flow pressure drop calculator covers that side.
  • Filter flux ratings (gpm per ft² of filter area) and velocity limits on suction/return plumbing cap the usable flow independently of turnover.
  • Variable-speed pumps usually hit the same daily turnover cheaper by running longer at lower flow — the daily-volume output is the constant to hold.

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