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Pool Filter Area - CPO® Math Tutorial

Filter Area is very much related to the manufacturer's specification for the amount of water flow through the filter in question. These specifications are governed by standards as established by the National Sanitation Foundation International (NSFI). The CPO® student should review the next section covering Filter Media Rates before any further examples are offered regarding filter sizing.

Things to know about Filter Area

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The area of a sand filter is measured as the top of the sand.

The area of a pleated cartridge filter is usually taken from the
manufacturer's specification on the top cap.

The area of a D.E. filter is the total surface area of all of the grids that the water
flows through.
Examples:

  • 20 circular D.E. grids measuring 19 inches in diameter.
    Each grid has 3.75 sq. ft. of total surface area.
    What is the filter area (FA)?
    Filter Area

     

    One grid is 3.75 sq. ft.
    There are 20 grids
    FA = 20 grids x 3.75 sq. ft. per grid
    FA = 75 sq.ft.

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