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Thread: Crystal looking granules after pool opening

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    Crystal looking granules after pool opening

    Hi. I just opened my pool this past Wednesday. This'll be the first time it's been opened. I put my Polaris in and came back a few hours later and noticed something was in the bag weighing it down. I opened it and there is this stuff in there that looks like sleet.....or clear rock salt. What is this stuff? So far, I've recovered about three fist sized amounts

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    Mod Squad tim5055's Avatar
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    Re: Crystal looking granules after pool opening

    Did you open the pool, or did someone do it for you? What has been added to the water and do you have a full set of test results.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: Crystal looking granules after pool opening

    I had someone open the pool. They added 5 lbs of shock, algaecide, and stain remover.

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    Re: Crystal looking granules after pool opening

    And I don't have a full set of test results yet......but I did test the ph with my Taylor kit and the pool wants 135 oz or muriatic acid and the calcium hardness is around 550.

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    Mod Squad tim5055's Avatar
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    Re: Crystal looking granules after pool opening

    I'm going to,guess you just vacuumed up a bunch of his shock. You really need to do a full set of tests. Our methods are based on only adding what the pool needs when it needs it. Depending. On the shock used they just added a bunch of CYA or CH, not sure which. Your CH is already high but without a full set of test results we can't say about the CYA.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Patrick_B's Avatar
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    Re: Crystal looking granules after pool opening

    Have you always used Muriatic for pH adjustment?
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    Divin Dave's Avatar
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    Re: Crystal looking granules after pool opening

    sounds like calcium sulfate. A link to an article below will tell you some about it. The author of the article is a member here on TFP. Its rarely encoutered but strangely, you are the 3rd person this year to report something like this.

    Usually, calcium sulfate crystals form because of high calcium content in the water and sulfates.
    Sulfates can enter the water from using dry acid to bring down pH. Im sure there are other sources too.
    Calcium of course is from either adding too much calcium chloride to get the pH up or naturally occuring in your fill water.

    http://aquamagazine.com/content/post...-Crystals.aspx
    Divin Dave,
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    Re: Crystal looking granules after pool opening

    Is it similar to the crystals in in this thread ?
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    Re: Crystal looking granules after pool opening

    Quote Originally Posted by Divin Dave View Post
    sounds like calcium sulfate. A link to an article below will tell you some about it. The author of the article is a member here on TFP. Its rarely encoutered but strangely, you are the 3rd person this year to report something like this.

    Usually, calcium sulfate crystals form because of high calcium content in the water and sulfates.
    Sulfates can enter the water from using dry acid to bring down pH. Im sure there are other sources too.
    Calcium of course is from either adding too much calcium chloride to get the pH up or naturally occuring in your fill water.

    http://aquamagazine.com/content/post...-Crystals.aspx
    Very interesting article!

    Quote Originally Posted by zea3 View Post
    Is it similar to the crystals in in this thread ?
    Interesting thread.
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    Re: Crystal looking granules after pool opening

    Patric_B,
    Yes, I only ever use muriatic acid. I but the stuff at Home Depot.

    Divin Dave,
    I never used dry acid. I read the article. It sounds like calcium sulfate. Sulfates entering my water are maybe from the muriatic acid I get from Home Depot?? It isn't 100% pure muritraic acid and may have an additive. Per the article, "Generally speaking, if an appreciable amount of sulfate finds its way into pool water, it has been introduced as a component of treatment chemicals. These treatment chemicals can include one type of liquid pool acid (sulfamic acid), dry acid (sodium bisulfate), dechlorinators (sodium sulfite and sodium thiosulfate), and even non-chlorine shocks (such as persulfates). That’s what we think happened here."

    Zea3,
    YES!!!! That's what it looks like!

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