According to wikiHow.com

As all pool owners know, it's a complete system that needs maintaining so that your cement pond stays crystal clear and refreshing. Water clarity is a combination of maintaining the chemical balance of your pool, and proper filtration. This article will help you get a handle on your filtration needs, and how long the filter should be run for optimal effect. Read on!

Step 1
Use this equation: (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. Let's break that down:

Step 2 

  • Know the volume of your pool. How long you run the filter depends on the size pool to filter ratio.

  • If you have a small filter you will need to run the filter longer, depending on how many gallons the filter can process in an hour. (Google the flow rate of your pool pump.)

  • Calculate the volume of your pool by multiplying the length x width x 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 pool that has an average depth of 5 feet (1.5 m).

Step 3 

  • Determine the flow rate of the pump. Include the resistance to flow in your plumbing system. (Google the flow rate of your pool pump.)

  • The pump manufacturer can tell you the flow rate for certain resistances.

  • You can estimate your pool plumbing resistance to be 20 ft/lbs for small pools, and 40ft/lbs for large pools or installations where the pool pump is far removed from the pool area.

  • Waterfalls and elevated solar systems will cause the ft/lbs resistance in the line to increase.

  • An average 1 HP pump will move about 50 gallons (189.3 L) per minute. This would be 3,000 gallons (11,356.2 L) per hour.

Step 4- Calculate the turnover rate for your pool:

  • The minimum recommended turnover for a pool is two complete turnovers within 24 hours. 
     

  • For example, using a pool volume of 19,149 gallons (72,486.9 L), and a filtration rate of 3,000 gallons (11,356.2 L) 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 two full cycles.

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