Oval Circumference Calculator

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Reviewed by: David Chen, Certified Pool & Spa Technician (CPST)

Maintain a crystal-clear pool by determining the exact run time needed for your filtration system. Input your pool volume and pump specifications below to get started.

Pool Pump Run Time Calculator

Enter values to see results

Pool Pump Run Time Calculator Formula

Run Time (Hours) = (Pool Volume × Turnovers) / (Flow Rate × 60)

To learn more about pool hydraulic efficiency, visit: Trouble Free Pool or Swim University.

Variables:

  • Pool Volume: Total gallons of water your pool holds.
  • Flow Rate: Measured in Gallons Per Minute (GPM), this is how fast your pump moves water.
  • Daily Turnovers: The number of times you want the entire pool volume filtered per day (typically 1 is sufficient).
  • 60: Constant used to convert minutes into hours.

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What is Pool Pump Run Time?

The pool pump run time is the duration required for your pump to circulate the total volume of water through the filtration system at least once. This process is called a “turnover.” Ensuring a proper turnover rate is essential for keeping the water sanitized and clear.

In standard residential pools, a single turnover per 24 hours is usually enough to maintain clarity. However, during heavy usage or high heat, increasing the run time to 1.5 or 2 turnovers may be necessary to prevent algae growth.

How to Calculate Pool Pump Run Time (Example)

  1. Identify Volume: Assume you have a 20,000-gallon pool.
  2. Determine Flow Rate: Check your pump label or flow meter; assume 50 GPM.
  3. Set Turnover: Aim for 1 turnover per day.
  4. Apply Formula: (20,000 × 1) / (50 × 60) = 20,000 / 3,000 = 6.67 Hours.

Frequently Asked Questions (FAQ)

How many hours a day should I run my pool pump?

Typically 8-12 hours during summer and 4-6 hours during winter, depending on your pool’s size and pump flow rate.

Is it better to run a pool pump at night or day?

Running it during the day helps distribute chemicals while UV rays are strongest, but running at night can save on peak electricity costs.

Does running the pump longer save chemicals?

Yes, circulation ensures sanitizers like chlorine are evenly distributed, preventing “dead spots” where bacteria thrive.

What happens if I don’t run my pump long enough?

Debris will settle, water will become stagnant, and algae blooms can occur within 24-48 hours in warm weather.

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