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Pool Flow Rate Calculator

The pool turnover rate is important for proper filtration. Not cycling enough water through the filter can result in swimming pool algae blooms, cloudy pool water, and water balance issues.

Calculate the flow rate needed to achieve proper filtration.

Pool Gallons:
Turnovers / Day:
Time / Turnover:

Flow Rate:

One turnover only filters 37% of the water. After a second turnover, 86% of the water has been filtered. It takes four turnovers to filter 98% of the pool water. Many commercial codes require a minimum of 4 turnovers per 24 hours.

Different water use has different filtration needs; therefore, they have different recommended target turnover times. The volume of water, activity, and contamination load must be considered when factoring in the optimal turnover rate.

The Importance of Knowing Your Pool’s Turnover Rate:

  • Filtration

    If it is too slow, your pool isn’t effectively being filtered.

  • Savings

    If it is too fast, you are likely paying more than you should in energy costs.

  • Maintenance

    Without efficient pool turnover, water quickly grows algae and collects dirt.

  • Environment

    It allows you to be more environmentally friendly.

  • Economic

    Ensures pool cleanliness without breaking the bank.

Featured Flow Meters

Commercial use

F-300 Variable Area Flow Meter


2 - 1900 8 - 7200
75 5.2
Pipe Sizes
1”, 1¼”, 1½”, 2”, 2½”, 3”, 4”, 6”, 8”

Residential use

R-300 Residential Pool Flow Meter


10 - 150 37.8 - 567
75 5.2
Pipe Sizes
1½”, 2”, 2½”

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