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Thread: Question about sand

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    Question about sand

    I am looking to change my sand in my filter. I need #20 .40 - .55mm sand and uniformity coefficient less than 1.75. The pool store has sand but the only numbers on it are 49/20. Does that mean it's .49mm / #20?
    24000 Gallons
    Cristal-Flo Hi-Rate Sand Filter
    IG - Vinyl
    3/4 HP Pump, and 44 Flow Rate
    Older than 10 years.

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    Azgirl71's Avatar
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    Re: Question about sand

    I believe it does. I will let someone one else confirm though.

    Why are you changing your sand? It does not have to be changed every 5 years as they say.

    Have you tried deep cleaning already?


    Deep Cleaning a Sand Filter
    Lisa
    Intex AG vinyl 15' x 48" 4,300 gallons due to skimmer install, Krystal Clear SF pump combo 2800 GPH, Krystal Clear SWG, Pool Blaster Max vacuum, Hayward thru the wall skimmer, TF 100 test kit with speed stir, K 1766 Taylor salt test, My SLAM Process

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    Re: Question about sand

    I wasn't going to change my sand. I bought this house 4 years ago and I am not sure when the sand was last change. For the most part my pool is very clear but, last year I started getting this dirt/dust on my pool floor. I was convinced it was mustard algae so completed the SLAM and then raised my pool up to mustard algae shock levels for 24hrs and it came back.

    Anyway, I opened up last weekend and now the stuff is back. Pool is clear, passed OCLT. I don't think it's algae because it was showing up when my FC levels were at 22. It also seemed to appear quickly after I brushed my pool. So, I figured maybe my filter is not able to filter it out and that is why I was thinking about changing my sand.

    Oh, and yes I have tried deep clean last year.

    It looks similar to what Gdog posted in this thread.
    What is this in my pool ?
    Last edited by epxroot; 05-30-2015 at 03:34 PM. Reason: Adding more
    24000 Gallons
    Cristal-Flo Hi-Rate Sand Filter
    IG - Vinyl
    3/4 HP Pump, and 44 Flow Rate
    Older than 10 years.

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    Azgirl71's Avatar
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    Apr 2015
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    Sierra Vista, Az
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    Re: Question about sand

    Ok. Just wanted to check. I am fairly certain the pool sand you found it correct. That is the same stuff I put in my filter and it is fine. Just remember to backwash and rinse the sand really well before letting it filter.
    Lisa
    Intex AG vinyl 15' x 48" 4,300 gallons due to skimmer install, Krystal Clear SF pump combo 2800 GPH, Krystal Clear SWG, Pool Blaster Max vacuum, Hayward thru the wall skimmer, TF 100 test kit with speed stir, K 1766 Taylor salt test, My SLAM Process

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    Re: Question about sand

    Thanks Azgirl!
    24000 Gallons
    Cristal-Flo Hi-Rate Sand Filter
    IG - Vinyl
    3/4 HP Pump, and 44 Flow Rate
    Older than 10 years.

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    Azgirl71's Avatar
    Join Date
    Apr 2015
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    Sierra Vista, Az
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    Re: Question about sand

    You are very welcome.
    Lisa
    Intex AG vinyl 15' x 48" 4,300 gallons due to skimmer install, Krystal Clear SF pump combo 2800 GPH, Krystal Clear SWG, Pool Blaster Max vacuum, Hayward thru the wall skimmer, TF 100 test kit with speed stir, K 1766 Taylor salt test, My SLAM Process

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    Join Date
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    River Falls, WI
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    Re: Question about sand

    You could always add some de:Pool School - Add DE to a Sand Filter

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