Finding the Right Size of Cartridge Filter for your Pool  

by Pool Builders on 04-09-2011 in Articles

There are a number of factors that need to be considered in determining the size of your pool filter. You must consider the size of the pool, the volume of water and how often the water needs to be turned over. The filter must be appropriately sized to work with the pump as well.

If you must determine the size of your pool and the number of gallons it holds, you can easily calculate them by measuring the length, width and varying depths of your pool.

To determine the volume of a circular or oval pool, you multiply the length by the width by the average depth by 5.9. To determine the average depth you will need to add the measurements for the shallowest and deepest parts of the pool and divide that number in half.

For example, if the deep end of the pool is 6 feet and the shallow end of the pool is 3, the average depth is 4.5 feet.
Using that example, if the pool is 30 feet in length and 20 feet in width, you would calculate 30 x 20 x 4.5 x 5.9 to yield 15,930 gallons of water. If there is a spa attached to your pool you can add approximately 500-600 gallons of extra water, depending upon the size of the spa.

If you have a square or rectangular pool, the calculations are the same: pool length multiplied by pool width multiplied by averaged depth multiplied by 7.2. Once again, it is suggested that you add approximately 500-600 gallons extra for an attached spa.
After calculating pool size you next need to consider the horsepower of the pool pump. Check with the manufacturer's instructions to best determine the horsepower of your pump. To give you an example, however, a horsepower pump has a water flow of approximately 40 gallons each minute, while a two horsepower pump has a water flow of approximately 87 gallons each minute. Knowing the strength of your pump will enable you to determine how long it would take to turn over the water in your pool. If your pump is of sufficient strength, it should be turning water over every eight to 10 hours.

Together, the volume of water and water flow should provide you with enough information to determine the amount of filtering space that your pool will need. For a pool of approximately 10,000 gallons with a horsepower pump, a cartridge filter of between 100 and 200 square feet of filtering space would be sufficient. For more information or to better determine what cartridge filter is right for your pool, visit Pool Cartridge Deals.

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