PDF download Download Article PDF download Download Article

As pool owners know, all of its systems need maintaining so that the water stays crystal clear and refreshing. Water clarity is a combination of maintaining the chemical balance of your pool and proper filtration. Make sure you’re running your filter properly by running it longer when it’s hot out, and during the day. You can also determine how long you should run the filter in your pool specifically, based on its volume and the speed of its filter.

Method 1
Method 1 of 2:

Calculating Run Time per Day

PDF download Download Article
  1. Determine the volume of your pool . How long you run the filter depends on the pool size to filter ratio. Calculate the volume of your pool by multiplying the length by the width by the average depth in feet.
    • Multiply this number by a standard multiplier, which is 7.5 for rectangular and square pools and 5.9 for other shapes.
    • Example: 16*32*5*7.48 = 19,149. This would give the volume of the pool in gallons for this 16x32 inch pool that has an average depth of 5 feet.
    • If your pool has different areas of depth to it, calculate the volume of each area of depth before adding them all together to find the total volume of your pool.
  2. Include the resistance to flow in your plumbing system. You can estimate your pool plumbing resistance to be 20ft/lbs for small pools, and 40ft/lbs for large pools or installations where the pool pump is far removed from the pool area. [1]
    • The pump manufacturer can tell you the flow rate for certain resistances.
    • An average 1 HP pump will move about 50 gallons per minute. This would be 3,000 gallons per hour.
    Advertisement
  3. The minimum recommended turnover for a pool is 2 complete turnovers in any 24 hour period. Use this equation to see how long you should run your filter: (Pool Volume ÷ Filtration rate) x 2 = Hours to run filter. This will tell you how many hours to run your pump to filter the water a full 2 times. [2]
    • For example, using a pool volume of 19,149 gallons and a filtration rate of 3,000 gallons per hour:
      • (Pool Volume ÷ Filtration rate) x 2 = Hours to run filter
      • (19,149 ÷ 3000) x 2 = 12.766, or about 12 hours and 45 minutes for a full 2 cycles.
  4. Advertisement
Method 2
Method 2 of 2:

Following Basic Rules for Filtering

PDF download Download Article
  1. A general rule of thumb you can follow year-round is running your filter dependent on the temperature. In the winter, you’ll be running it 6 or fewer hours, while in the summer, you might have to go a full 12. [3]
    • If you’re experiencing temperatures of 80 °F (27 °C) or greater, you should be running your filter about 10-12 hours regardless. [4]
  2. These warm temperatures are when algae is most likely to start growing in your pool water. Run the filter with chlorine the entire length of the day in these cases to avoid any chances of algae turning up in your pool. [5]
    • Although running your filter at night may save you energy, it does nothing to prevent the algae from forming during the day when it’s actually got a chance to, unlike at night.
  3. Your pool filter is intended to be run for up to 12 hours a day consistently. You can run it on its lower settings normally, and then on the higher settings when you’re adding the chlorine or other cleansers to the water. [6]
    • This way, you’ll be ensuring you’re filtering out the entire contents of your pool at least 2 times a day.
    • If you have a small filter, you will need to run the filter longer depending on how many gallons the filter can process in a given time. Don’t worry about running it for too long, it’s better to overrun your filter than not run for long enough.
  4. Over the course of a pool’s life, you’ll need to have the filters cleaned out if they’re dirty or clogged with debris. Otherwise, you may find you’re having to run your filters for longer to achieve the same effect. [7]
  5. Advertisement

Community Q&A

Search
Add New Question
  • Question
    Do I need a 220 line to run a 3/4 hp pump?
    Community Answer
    220 is more efficient than 120 and will help keep the energy usage lower. Run time depends on size of pool and hydraulics. Residential In-ground pools are generally hydraulically built to run 8 hours a day for proper turnover rate, with a temperature of 80 degrees. Every 10 degrees warmer than 80 degrees pump should be run 1 hour longer. For example, 90 degrees run 9 hours. This is for a single speed pump running 3450 rpm.
  • Question
    How long should the filter pump run after the two 12 hour turnovers?
    Community Answer
    Let the filter rest for about a day, then run the filter in 6 - 8 hour intervals every day that you want to use your pool.
  • Question
    My pool was clear while the sand filter was running, but when I scrubbed, the walls were green again. Any suggestions?
    Pool Lady
    Community Answer
    Check the balance of your water. It may just need to be super-shocked. Depending on the size of your pool, a bottle of vitamin C tablets could solve your problem. Just a note, know what you need before you go to buy your chemicals. Pool stores sell chemicals. It is how they survive.
See more answers
Ask a Question
      Advertisement

      Video

      Tips

      • Add your chemicals at night when the sun is not depleting the chlorine in your pool.
      • Regularly examine the water for bugs, plant material, dirt, and other contaminants. Skim the surface with a net, and vacuum the bottom and sides.
      • Run your pool pump at night for cooler operation of your pump.
      Show More Tips
      Submit a Tip
      All tip submissions are carefully reviewed before being published
      Thanks for submitting a tip for review!
      Advertisement

      About This Article

      Article Summary X

      If you need to know how many hours to run a pool filter, determine your pool's volume by multiplying the length, width, and depth of the pool. Next, divide the pool volume by the filtration rate, which you can get from the pump’s manufacturer. Then, multiply that answer by 2 to calculate how many hours you need to run your pool's filter! Read on to learn the minimum turnover for a pool.

      Did this summary help you?
      Thanks to all authors for creating a page that has been read 522,234 times.

      Reader Success Stories

      • Richard Cook

        Aug 28, 2017

        "I am new to the pool world and was not sure how to run the filter system on a daily basis."
        Rated this article:
      Share your story

      Did this article help you?

      Advertisement