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Thread: Water gushing out during backwash - Hayward Sand Filter

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    PomeranianLover's Avatar
    Join Date
    Jun 2011
    Richmond, VA

    Water gushing out during backwash - Hayward Sand Filter


    I'm new to TFP And pool ownership (recently bought a home with an in-ground pool) and I have already found these forums SO helpful!

    We've been doing a good job backwashing and rinsing (about once per week) but when I backwashed today I saw that water and sand were literally GUSHING out of the drain pipe (buried pipe drains out to the street) when on the 'backwash' setting. Its like it thinks it is on the 'waste' or 'rinse' setting instead of the backwash setting!

    From reading on this forum a bit I think it may be due to the 'spider' valve but I wanted to see if anyone thought it could possibly be anything else before I went ahead and bought a new one. (This is our replacement part: Hayward SP0714T, ... B00269II66)

    Thank you in advance!

    Richmond, VA

    Inground, Salt Water, Kidney-Shaped Pool
    Vinyl Liner
    Hayward Pro-Series Sand Filter
    AquaRite Electronic Chlorine Generator
    Pentair SuperFlo Pump
    23000 In Ground Freeform Gunite/White Plaster
    1HP A.O.Smith, 48 SqFt DE

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    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    East Texas

    Re: Water gushing out during backwash - Hayward Sand Filter

    Replacing the spider gasket is the first, best, and cheapest best guess!
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

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    Re: Water gushing out during backwash - Hayward Sand Filter

    Hi Molly, forgive me if I misunderstood your question but "backwashing" should in fact direct water and dirt out your waste pipe, (preferably with not too much sand). Backwashing cleans your sand filter by using pool water to port through the filter in a reverse manner and this "dirty" water should go out the waste pipe. Using the rinse mode after backwashing, cleans the lines, and valve, of any remaining dirt.

    Hope this helps,
    Attached Images Attached Images
    "Experience is what you get, just after you needed it."

    Owner DIY build, steel/liner kit, 18x36 Deer Creek, sport depth, approx 17,500 gal,
    Aqua Plus SWG, 1 1/2 hp, 2 speed, 300# sand filter and twin Color logic 4.0s, MX-8 Cleaner.
    My DIY Pool Build

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