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)
125 L/min
Pass

Volume ÷ target turnover — the minimum delivered flow.

Also computed

Actual turnover Pass 6.667 h

Meets the target turnover.

What the entered pump really achieves.

Turnovers per day 3

Daily filtered volume 180,000 L

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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