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Thread: Calcium hardness is 700!

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    Calcium hardness is 700!

    Hello!

    I just got my TF-100 test kit and when that ups man rang my doorbell it was like Christmas in July! Anyway I tested my pool right away and here are my results:

    FC 3.5
    CC .5
    Total chlorine 4
    TA 80
    CH 700
    CYA 25 to 30

    Calcium hardness is crazy! I have the app that let's me plug in my current and desired numbers and it said to replace 57% of my water. Uh...not going to happen. We have very hard water here in my suburb of Houston so I doubt it will even help. Our pool is only 1 month old so is this high calcium just from the new luna quartz plaster?

    Is there a way to lower this?
    17,000 inground gunite pool finished June 2013. Pentair variable speed something or another. Polaris cleaner, inline rainbow chlorinator. Using trichlor until CYA reaches 50-60.

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    Re: Calcium hardness is 700!

    Oh...pH is 7.2.
    17,000 inground gunite pool finished June 2013. Pentair variable speed something or another. Polaris cleaner, inline rainbow chlorinator. Using trichlor until CYA reaches 50-60.

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    Mod Squad Bama Rambler's Avatar
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    Re: Calcium hardness is 700!

    Did you get the SpeedStir?

    Test your tap water for everything except CYA.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    Mod Squad jblizzle's Avatar
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    Re: Calcium hardness is 700!

    The only way to lower the CH is by replacing with water that has a lower CH value. Yes it is high, but you can still manage the pool by keeping the pH in range (like between 7.0 and 7.5 at all times).

    It is pretty odd to be that high after a new fill ... I am wondering if this might be a false reading due to the new plaster??? Maybe someone else will have a thought on this.

    As Dave suggested, testing the tap water is a good idea. And the CH test can be problematic if you are not swirling the water enough.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: Calcium hardness is 700!

    It might be test error. Try adding 5 drops of reagent r-0012 first, and then do the test as normal. Add 5 to the counted drops. Did the builder do an acid startup? What is the calcium of the fill water? Did the builder add calcium?
    Is there copper in the water? Is this well water?

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    chiefwej's Avatar
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    Re: Calcium hardness is 700!

    So what. My CH is 1,200. Too high and I will be doing an RO treatment on the water to reduce it. But in the interim, I just keep a close eye on TA and pH, so that the CSI says at or very near zero and its not a problem.

    My fill water varies but can run 250+ CH. The evaporation rate is insane here in the middle of a desert. So I just have to carefully balance the water chemistry to avoid scale. If you let your pH get high, you will have scale.
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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    Re: Calcium hardness is 700!

    Okay I tested my tap water:

    FC 1.0
    CC 0
    TA 200
    CH 150

    Dang it! I wonder if its the plaster...or I wonder if the pool builder added calcium to the pool. We did do an acid startup. He filled my auto chlorinator with 3" tabs and his pool guy dumped pool chemicals in for the first two weeks.

    I'm currently using bioguard trichlor silk tabs, and I used bioguard lithium hypochlorite shock. Neither add calcium. ***? We've hosed off the DE filters once and there was a ton of plaster in there. My pool is super clear, sparkly and blue. I'm just afraid the calcium will wreck havoc on my pool.
    17,000 inground gunite pool finished June 2013. Pentair variable speed something or another. Polaris cleaner, inline rainbow chlorinator. Using trichlor until CYA reaches 50-60.

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    Re: Calcium hardness is 700!

    I would suggest asking the builder why the calcium is so high.

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    Re: Calcium hardness is 700!

    Okay I freaked out prematurely. I retested and um...my CH is only 350. I used a clean plastic straw to mix the test tube instead of just swirling. I'm a dork. It's at the high level of average but much better than 700!!!

    Silver lining...I learned about CSI levels. So does this basically mean that if I keep my pH at 7.0 or 7.2, that all will be well?
    17,000 inground gunite pool finished June 2013. Pentair variable speed something or another. Polaris cleaner, inline rainbow chlorinator. Using trichlor until CYA reaches 50-60.

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    Mod Squad jblizzle's Avatar
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    Re: Calcium hardness is 700!

    With the lower CH, you likely do not want your pH that low. Keep it around 7.5 (between 7.2 and 7.8)
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    Re: Calcium hardness is 700!

    Good to know! I've been adding muriatic acid every three days or so because my pH creeps up to 8 pretty quickly. I measure it out for a target of 7.2 just so I can go longer before adding more acid, but ill try to stay closer to 7.5.

    Y'all are seriously so helpful. Thank you!
    17,000 inground gunite pool finished June 2013. Pentair variable speed something or another. Polaris cleaner, inline rainbow chlorinator. Using trichlor until CYA reaches 50-60.

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