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Thread: Preventing Calcium Carbonate at Water Line?

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    Preventing Calcium Carbonate at Water Line?

    Is there any way to prevent calcium carbonate build-up at the water line?

    I recently became a sub-contractor for a pool that has an owner that wants a "Scale-Stain Controller" to be added to the pool.

    It claims the following:

    Absolutely phosphate free formula.
    Aggressively prevents and removes scale and stain buildup.
    Salt cell de-scaler (without acids), protector and prolongs cell lifespan.
    Controls calcium (up to 1,000 ppm) and hard silicates (up to 300 ppm).
    Strongly sequesters iron, copper, and manganese metals.
    Protects all equipment: filter, heater, water auto-leveler, salt cell, and solar unit.
    Provides long lasting protection: pool finish, tile and equipment.

    Affordable year-round protection.
    Extends life of salt cell generators.
    Prevent future costly washing and tile cleaning.
    Advanced Synertec formula is both acid-free and phosphate-free.
    Chlorine stable multi-polymers lasts for months, not weeks.

    It seems like snake oil.

    Thanks

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    gtemkin's Avatar
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    Re: Preventing Calcium Carbonate at Water Line?

    Is this the stuff you're talking about? Seems to use the same wording.

    http://www.mcgrayel.com/files/Beaute...2012%20web.pdf
    21K gal 16' x 40' in-ground pool built 1959, old school with Jacuzzi bronze pump, American Products 24" Sand Filter & Americana Multiport valve, Jandy Lite2 millivolt heater, Coverstar cover, and classic Kreepy Krauly.

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    Re: Preventing Calcium Carbonate at Water Line?

    Yes, I didn't want to post a link to it.

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    Re: Preventing Calcium Carbonate at Water Line?

    Is there any reason why the owner doesn't simply want the pool to be balanced? Seems like there's a better way to control scale than to ask Harry Potter to pour a magic potion in the pool.
    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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    Re: Preventing Calcium Carbonate at Water Line?

    The owner wants the water to be balanced and to absolutely prevent calcium carbonate build-up at the water line.

    I'm not sure how the latter is reasonably achieved.

    Perhaps with "Scale-Stain Controller".

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    Re: Preventing Calcium Carbonate at Water Line?

    But if the water is balanced, doesn't that inherently prevent scale buildup? There's a lack of chemistry understanding somewhere here...
    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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    Re: Preventing Calcium Carbonate at Water Line?

    Quote Originally Posted by Smykowski View Post
    But if the water is balanced, doesn't that inherently prevent scale buildup? There's a lack of chemistry understanding somewhere here...
    At the water line?

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    Richard320's Avatar
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    Re: Preventing Calcium Carbonate at Water Line?

    Keep the CSI towards the negative and there won't be a problem. Even with CH pushing 4 digits, I've never had a buildup.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Re: Preventing Calcium Carbonate at Water Line?

    There will always be buildup at the waterline just due to water evaporation leaving mineral deposits behind ... even if the water is balanced.
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    Re: Preventing Calcium Carbonate at Water Line?

    Will the "Scale-Stain Controller" do anything?

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    Re: Preventing Calcium Carbonate at Water Line?

    A slightly negative CSI will reduce the buildup, but as noted with wetting and evaporation there will be some buildup of solids. Scale inhibitors might somewhat reduce this only by making the solids less likely to adhere to the surface, but there's no guarantee. There might be some sort of tile sealant that inhibits anything sticking to it, but I'm not aware of specific products that do this.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
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    Re: Preventing Calcium Carbonate at Water Line?

    I think a lot of the issues I had at the waterline were due to broadcasting cal-hypo. Some would cling to the waterline even though I brushed it in with the Wall Whale.
    Now if I use cal-hypo I pre mix it in a bucket and put the last little bit into the skimmer, under the skimmer sock as that will deteriorate a skimmer sock.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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    Re: Preventing Calcium Carbonate at Water Line?

    Thanks

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    Re: Preventing Calcium Carbonate at Water Line?

    See also my response in this post regarding possible use of a sealant that is hydrophobic where water would bead up so hopefully run off and not stick around to evaporate and leave any residue.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    Re: Preventing Calcium Carbonate at Water Line?

    Quote Originally Posted by jblizzle View Post
    There will always be buildup at the waterline just due to water evaporation leaving mineral deposits behind ... even if the water is balanced.
    This has been my experience as well. I have to deal with very high CH levels and a negative CSI does not seem to be sufficient. I try to keep my CSI around -0.5 for this and the SWG.

    But I think the autofill makes it worse because the water line never changes and I get a very distinct line unless I brush the tile every week. Also, it seems to collect more when I use the solar cover than without. Again, I think it has to do with a stable water line.
    Mark
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    Re: Preventing Calcium Carbonate at Water Line?

    Quote Originally Posted by anonapersona View Post
    Now if I use cal-hypo I pre mix it in a bucket and put the last little bit into the skimmer, under the skimmer sock as that will deteriorate a skimmer sock.
    Seems that would still deteriorate your equipment.
    20,000 gal in-ground plaster pool with sand filter. Replastered recently. Mostly adding bleach and acid. CYA was high when I took over.

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    Re: Preventing Calcium Carbonate at Water Line?

    Quote Originally Posted by SwimAustin View Post
    Seems that would still deteriorate your equipment.
    I figure that last tablespoon of cal-hypo will dissolve pretty quick when it is caught in the filter.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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