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Thread: Sand (or fine silt?) coming from return vent?

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    Join Date
    Jul 2011
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    Northern MN
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    Sand (or fine silt?) coming from return vent?

    Hi all,

    I am wondering if someone can comment (or point me to a thread) on sand coming out of the return vent. I have a sand filter and have noticed lately that when I run it for a longer period of time like overnight, I get small buildups of brown sand (or fine silt, maybe?) on the floor of the pool. My pool floor will start out clean before running the filter, and then will have the small brown piles. As I say, I am not sure what they are made up of - maybe it isn't sand at all. Could it be dirt or sand so fine that the filter doesn't trap it? Besides that, the water looks great, levels are fine, flow and pressure are good, I backwash as required, etc. Any hints?

    Thanks!
    24-ft round Radiant AG, fully in the ground, 14,500 gal
    Sand filter, 1.5 HP pump, vinyl liner
    9 months of winter, 3 months of tough skating!

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    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 (or fine silt?) coming from return vent?

    Can you get some and put it between your fingers? If it's sand, it will be obvious. If not sand, it's likely dirt or dead algae.
    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
    The most important article on this site - The ABCs of Pool Water Chemistry

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    Join Date
    Jul 2011
    Location
    Northern MN
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    Re: Sand (or fine silt?) coming from return vent?

    Haven't done that yet with my fingers yet, but according to my wife's toes, and the way it "vaporizes" when brushed, it is very fine and probably not sand. If it's not sand, do I just keep vacuuming it up and hope it stops collecting, or could it be recirculating?

    Anyway, I'll get my fingers on it and examine it better.

    Thank you.
    24-ft round Radiant AG, fully in the ground, 14,500 gal
    Sand filter, 1.5 HP pump, vinyl liner
    9 months of winter, 3 months of tough skating!

  4. Back To Top    #4
    Smykowski's Avatar
    Join Date
    Sep 2011
    Location
    Gurnee, IL (North Suburban Chi-town)
    Posts
    3,065

    Re: Sand (or fine silt?) coming from return vent?

    Can you post a full set of test results? Any areas of poor circulation that algae might be hiding? Any algae or dust/dirt collecting on a solar cover that could be getting in the water?
    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
    The most important article on this site - The ABCs of Pool Water Chemistry

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