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Thread: CH levels ~100, liner feels like sandpaper

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    Join Date
    Jun 2010
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    NW Foothills of North Carolina
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    CH levels ~100, liner feels like sandpaper

    After the pool had clear (can see the drain) and vacuumed pretty good, I finally did my first test this week.

    FC = 0.5
    pH = 7.5
    TA = 50
    CH = 70
    CYA = Didn't test.

    So I added 14 lbs of sodium bicarbonate, added 5 lbs of calcium chloride (bioguard Balance pak 300), 4 lbs of stabilizer, 121 oz of 12.5% bleach.

    Today, I did another test.
    FC = 0
    pH = 7.2
    TA = 60 (66 at pool store)
    CH = 105 (117 Hardness at pool store)
    CYA = Didn't test. (10 at pool store)

    Then I noticed that the liner felt like sandpaper. I had read that it could be scaling, so I had the pool store to test the water also, to make sure my test kits are still working. So is it calcium, or do I still have an algae problem? Does any algae feel like sandpaper? My brush doesn't remove it.
    21K gallon, 16 x32 IG Vinyl, 3/4 HP Hayward Superpump,
    200 lbs Sand filter, Full sun all day

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    frustratedpoolmom's Avatar
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    May 2007
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    SWSuburban Chicago, IL
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    11,965

    Re: CH levels ~100, liner feels like sandpaper

    No sounds like calcium scale. If this is new, you can keep the PH at 7.0 for a couple of weeks and brush daily to try to dissolve it. You can also try a scale treatment purchased from a pool store.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Re: CH levels ~100, liner feels like sandpaper

    Quote Originally Posted by flash View Post
    So I added 14 lbs of sodium bicarbonate, added 5 lbs of calcium chloride (bioguard Balance pak 300)
    Can you describe how you added those products?

    Your readings don't indicate that scale would be likely. However, If the calcium and bicarb combined on the floor, then they could form the type of scaling you describe.

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    Re: CH levels ~100, liner feels like sandpaper

    I weighed the 14 lbs of bicarbonate, then walked around the pool spreading (throwing) cups of the the sodium bicarbonate into the pool. Then added the calcium the same way. I did not wait. I added the bicarb, then measured the calcium and added it to the pool. After that I brushed the bottom of the pool. I also don't know if the sandpaper feeling was there the day before. I just felt it when I was adjusting the returns.
    21K gallon, 16 x32 IG Vinyl, 3/4 HP Hayward Superpump,
    200 lbs Sand filter, Full sun all day

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    Casey's Avatar
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    Apr 2007
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    SW PA
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    Re: CH levels ~100, liner feels like sandpaper

    Why did you add the Calcium? Vinyl pools do not need Calcium.
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

  6. Back To Top    #6

    Re: CH levels ~100, liner feels like sandpaper

    Adding calcium directly on top of the bicarb is the likely cause of the scale. Try lowering the pH for a while, as suggested by FPM. Brush daily.

    Note: Brush lightly. If you scrub the scale too hard, you might damage the liner. Patience is key.

    Also, I would recommend avoiding adding any more calcium or any pH increaser.

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    Patrick_B's Avatar
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    Jun 2011
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    Re: CH levels ~100, liner feels like sandpaper

    I agree with James, please don't add any more of those.

    Lower the pH, keep it there and brush lightly...a lot and see if it doesn't improve. I bet it will.
    TFP Moderator
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    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

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