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Thread: sand blowing back into pool

  1. Back To Top    #1
    hurtback
    Guest

    sand blowing back into pool

    just joined and already found some good info..but not sure exactly where to post this
    now here's my problem
    40,000 gal Ig
    sand filter
    vinyl
    i think 3/4 horse pump
    not sure of the flow rate
    vacummed pool without basket in pump so any leaves went into filter
    backwashed and when i started filter had sand ( lots of it) blowing back into pool
    emptied filter and replaced 1 lateral
    filled back up with the sand ( but did not put water in first, ,which i read here)
    started filter ( forgot to backwash and rinse)
    but after a few seconds the sand stopped and water was flowing nice
    a few hours later i noticed sand blowing back into pool from shallow end return
    turned pool off and went back into house
    whats next?
    remove sand and check laterls again?
    any iddeas?
    thanks
    steve

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: sand blowing back into pool

    Welcome to TFP!

    I am afraid that you do need to open up the filter and examine the laterals again. Laterals can be broken very easily. It is quite possible one or more of them were broken by adding sand without water in the filter. Of course it is also possible that there was another broken one all along.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3
    hurtback
    Guest

    Re: sand blowing back into pool

    I did have them all out and looked at each one so I know none were broken , other then the one i had to replace.
    Oh, just in case , I did cover the tube with a plastic bag before adding the sand, so I know there was no sand inside that center tube
    Yea, after reading about filling the filter with water first, then adding sand, i thought i would be removing the sand again to check them.
    oh well, lesson learned...
    thanks,
    steve

  4. Back To Top    #4
    hurtback
    Guest

    Re: sand blowing back into pool

    ok, here's the million dollar question...
    if all the laterals are not broken, i add water and then add sand, backwash then rinse, and i still have sand flowing into the pool--
    what's next?

    steve

  5. Back To Top    #5

    Join Date
    Apr 2014
    Location
    Indiana
    Posts
    106

    Re: sand blowing back into pool

    Quote Originally Posted by hurtback View Post
    ok, here's the million dollar question...
    if all the laterals are not broken, i add water and then add sand, backwash then rinse, and i still have sand flowing into the pool--
    what's next?

    steve
    If you have one, make sure that the "Air Relief Tube" with the little screen on it is actually attached to the hole on the return side PVC pipe under the sand. Ask me how I know about this.

    22,000 gallon in-ground kidney-ish shape: 1 HP pump and Triton TR60 sand filter. NEW: Dolphin Nautilus robot! :)

  6. Back To Top    #6
    hurtback
    Guest

    Re: sand blowing back into pool

    hi,
    my filter has the ' flow in and return to pool ' outlets coming out of the head which is on top of the filter ( sorry no image to show you )
    nothing coming out of the sides of the filter
    i also don't have a ' air relief tube' on the head, only the little glass jar to check the water while backwashing
    with my filter the intake pipe goes straight down , thru the middle of the filter, to the bottom, with the 8 laterals connected at the bottom--so its just 1 pipe inside my filter
    steve

  7. Back To Top    #7
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: sand blowing back into pool

    When you have the filter apart, examine all of the pipes to make sure there aren't any cracks and make sure you get any required o-rings in the right place. Loose connections inside the filter that let a little sand through are not all that uncommon.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  8. Back To Top    #8

    Join Date
    Jun 2014
    Location
    north brunswick
    Posts
    5

    Re: sand blowing back into pool

    ok, looks like filters coming apart again tonight...
    hopefully i find a loose lateral and that solves the problem..
    will be back once i do that
    thanks for all the suggestions
    steve

  9. Back To Top    #9

    Join Date
    Jun 2014
    Location
    north brunswick
    Posts
    5

    Re: sand blowing back into pool

    Turned filter on last night and there was a liitle bit of sand blowing back into the pool from the low end return. After about 10 seconds the sand stopped. Checked all night long till about 1am and no sand blowing back into pool. Dont understand it, but, whatever.
    Now, with all the sand in the pool I should be able to vacuum up that sand ,should'nt I ???
    Is it possible that the sand might damage the pump?
    Just wanna make sure before I attempt this next step.
    Steve

  10. Back To Top    #10

    Join Date
    Jun 2014
    Location
    north brunswick
    Posts
    5

    Re: sand blowing back into pool

    any one have a suggestions???

    Steve
    I G,vinyl, sand filter, 40,000gal ,20x40

  11. Back To Top    #11
    Smykowski's Avatar
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    Sep 2011
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    Gurnee, IL (North Suburban Chi-town)
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    3,065

    Re: sand blowing back into pool

    I think in the amounts you're talking about, vacuuming the sand is fine. If it no longer blows into the pool, problem should be solved.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
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