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Thread: Sand Filter and SWG

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    Sand Filter and SWG

    Speaking of sand, my problem is with a new Intex 16'x32'x52" that came with a sand filter. I added the SWG.
    The type of sand I used was play ground sand from Lowe's but I am not producing enough chlorine. My SWG says my salt is low but I have ample salt.
    My flows go to almost nil and then I am daily having to backwash to get the flow to normal. I am thinking my low salt is really a low flow problem.
    Is this a type of sand problem?
    I am ready to buy the pool sand at Lowe's for $1.00/# bit want to see if I am missing something.
    Any help is appreciated.


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    Mod Squad pooldv's Avatar
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    Re: Sand Filter and SWG

    You definitely need to use #20 silica sand and not play sand. The low salt is probably because you need to clean the SWG cell with vinegar. The reason the filter is clogging up quickly is likely because there is not enough chlorine in the pool and algae is growing. This is how we kill algae, SLAM

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    Re: Sand Filter and SWG

    Ok, I will change the sand to #20 and clean my SWG. Yes, I am growing algae and been shocking with bleach but am behind the curve as I am working to balance my water.
    Thanks!

    Intex 32'x16'x52", 14Kgal, 2150 GPH stock pump, Intex SWG, generic wide skimmer mounted above sewn seam, hard piped 1.5" pvc

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    Mod Squad YippeeSkippy's Avatar
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    Re: Sand Filter and SWG

    Your focus now should be killing algae.. don't sweat the tweaking too much as the algae will become more and more a problem the longer you wait. You can tweak and balance after the water is cleared of the algae.
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    Re: Sand Filter and SWG

    Ok, will do. I am going to change out my sand now. You guys/gals are great.
    Thanks.
    Intex 32'x16'x52", 14Kgal, 2150 GPH stock pump, Intex SWG, generic wide skimmer mounted above sewn seam, hard piped 1.5" pvc

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    Re: Sand Filter and SWG

    Decided to wait on the sand replacement and SLAM to fight the algae but need more help on the SLAM.

    Added 15 ea 3 qt bleach bottles from Walmart called Top Job ($1.00/ea). The bottle has no chemical reference as to contents.

    My current readings:
    FC 3 1 drop w 10 mil
    CC 0.5 1 drop w 10 mil
    PH 7.1 10 drops to 7.6
    TA 130
    CH 130
    CYA 60 assume now b/c 65 this am, drained 4", refilled

    Now I bought 15 more bleach bottles at Walmart but changed to generic 121 OZ labeled sodium hypochlorite 8.25% ($2.94/ea).

    Question - do I have the right bleach type or should I go back to the Top Job? I discovered the math sheet and do not know what to input for either bleach product I have here.

    My reasoning was I had a cheap bleach it wasn't powerful enough to help me slam. Now I am concerned the 8.25% is the wrong product due to low chlorine content.
    Intex 32'x16'x52", 14Kgal, 2150 GPH stock pump, Intex SWG, generic wide skimmer mounted above sewn seam, hard piped 1.5" pvc

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    Re: Sand Filter and SWG

    The generic 8.25% is just fine... You don't need any other as long it doesn't have any scent or Splash-less comment in the label
    8,400 gal Intex, 3K GPH pump, 16" sand filter, SWG CG-28669, TF100 test kit, speed stir, K-1766 Taylor salt test.

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    Re: Sand Filter and SWG

    Great, thank you.
    Intex 32'x16'x52", 14Kgal, 2150 GPH stock pump, Intex SWG, generic wide skimmer mounted above sewn seam, hard piped 1.5" pvc

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    Piolin's Avatar
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    Re: Sand Filter and SWG

    You also can take a look at the Julian day stamped in the bottles, but from Wal-Mart it should be fresh
    8,400 gal Intex, 3K GPH pump, 16" sand filter, SWG CG-28669, TF100 test kit, speed stir, K-1766 Taylor salt test.

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    Re: Sand Filter and SWG

    Wow, very informative, thank you. Where is the stamp on the Great Value bottle? I see a raised stamp on the bottom under the recycle triangle and it is "210-21". Also see a black ink stamp on the neck of the bottle just below the handle "16 236 09:32 B2 TX-01". Not sure how to interpret this.
    Intex 32'x16'x52", 14Kgal, 2150 GPH stock pump, Intex SWG, generic wide skimmer mounted above sewn seam, hard piped 1.5" pvc

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    Re: Sand Filter and SWG

    It should start with the year and then the Julian day.. Most times you can find the stamp at the neck or sometimes at the bottom

    It should be the black ink stamp
    8,400 gal Intex, 3K GPH pump, 16" sand filter, SWG CG-28669, TF100 test kit, speed stir, K-1766 Taylor salt test.

    The corner stone of TFP
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    Re: Sand Filter and SWG

    Got it. It is on the neck.
    Intex 32'x16'x52", 14Kgal, 2150 GPH stock pump, Intex SWG, generic wide skimmer mounted above sewn seam, hard piped 1.5" pvc

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    Piolin's Avatar
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    Re: Sand Filter and SWG

    8-23-2016
    8,400 gal Intex, 3K GPH pump, 16" sand filter, SWG CG-28669, TF100 test kit, speed stir, K-1766 Taylor salt test.

    The corner stone of TFP
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    Re: Sand Filter and SWG

    Economy bleach and especially if it does not have a percentage of hypochlorite listed is usually under 6% - thus the low price. You're buying water then, not chlorine. It might work for clothes, but isn't concentrated enough for pools. Go for the good stuff. They usually have 12.5% in the pool section labeled "chlorinating liquid" though this late in the season they may not be restocking.
    16X32 AB, Pentair SD filter, 3/4hp Pentair Optiflo, CircuPool RJ30+ swg, TF 100

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