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Thread: Locating Backwash Line

  1. Back To Top    #1

    Join Date
    Aug 2015
    Lubbock, TX

    Locating Backwash Line

    Hi all,

    First time posting. Pool is in great shape, due to previous homeowner having a pool cleaning company. I have officially taken over and need help locating which pipe is my backwash line and what to open to let the dirty water espace during the process.

    All of my details are in the sig.


    16,000 - IG - Vinyl (LShape)
    Sand (Purex triton tagelus ta-50)
    A.O. Smith Centurior Switchless
    Built in 1990 - everything still original
    TF-100 test kit

  2. Back To Top    #2
    Mod Squad zea3's Avatar
    Join Date
    Jul 2009
    Houston, Texas

    Re: Locating Backwash Line

    Hi, welcome to TFP! If the label on the filter's multiport valve is legible, the segment labeled "waste" is where the water is released. There should be a pipe stub where you can attach a hose or pvc pipe underneath the section labeled "waste". If you can post a picture we should be able to identify the line for you if it is hard plumbed.
    TFP Moderator
    Helpful links: TF Test Kits,TFP Pool School, PoolMath
    Vogue 21' round AG, Pentair 1 hp 2 speed pump, 36 sq ft DE filter, Hayward S180T 150# sand filter, Houston, Texas
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  3. Back To Top    #3
    Mod Squad tim5055's Avatar
    Join Date
    May 2014
    Columbia, SC

    Re: Locating Backwash Line

    The operative word is "should". The previous owner of my house piped the backwash line underground. I have no idea where the water goes to.

    A photo or two of your set up would help us identify the parts for you.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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