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Thread: Filter sizing

  1. Back To Top    #1

    In the Industry
    Masspools's Avatar
    Join Date
    Jan 2013
    Cambridge Massachusetts

    Filter sizing

    Hi All

    I have a commercial pool with a Cartridge filter looking to convert over to a sand filter. I spec'd out a Pentair Tr-140c to replace it but I'm thinking maybe it is over kill for this pump. Should I go with Pentair Tr-100, Any thoughts?

    38,768 gallons,
    Pentair Whisperflo 2hp Sf 1.30.
    turnover of 6 hours (106 GPM)
    2" piping



  2. Back To Top    #2

    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Filter sizing

    Go with the TR-140. I have a 1.5 hp pump with a TR-140 and the combo is great.

    A TR-100 will be too small for your pump.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3
    linen's Avatar
    Join Date
    Jul 2010
    Twin Cities, MN

    Re: Filter sizing

    I am with duraleigh on this, our recommendation would be a minimum 7.2 sq. ft. sand filter...the TR140 is 7.1 sq. ft....close enough. Our recommendations come from the ANSI/NSF 50 Specifications, the table can be seen in
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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