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Thread: Another Newbie Chem question

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    Join Date
    Jul 2016
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    Fort Myers, FL
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    Another Newbie Chem question

    Glad I found this site!

    I'm a new pool owner, and have been having problems keeping my CYA at 70 - 80 ppm, and my pH below 8.0. About a week ago, I added granulated CYA in an attempt to raise CYA from 60 to 70 ppm. Yesterday, I added acid to lower pH from 8.0 to 7.4. It's been about a week since I added stabilizer, and my Taylor test readings are as follows:

    CYA = 60
    pH = 7.8
    Total Alk = 100
    Ca hardness = 275
    Free CL = 4
    Combined Cl = 0
    Water tem = 84

    With the addition of CYA, I expected CYA to increase, Alk to decrease, and my pH to stabilize.

    What am I doing wrong? Is it possible the aeration from my spa waterfall is effecting my chems? I understand my Ca hardness is low, but wanted to take care of the CYA/ pH problem first.

    Thanks,
    John
    Location: SW Florida
    Pool: In ground w/ spa water feature; 7,979 gals
    SWG
    Plaster/ pebble

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    In the Industry

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    Re: Another Newbie Chem question

    Have you gotten a lot of rain since you added the CYA? How did you add it? pH in salt water pools tends to rise incessantly until you hit a certain alkalinity level. I test hundreds of pools a week being in the industry and one thing I've noticed is that when the alkalinity hits around the 70 range roughly, although I've noticed lower thresholds, the pH rise will slow dramatically and stay more stable. Also, the aeration from the water feature can affect your pH, and the rain aerates the water as well. Aeration raises pH if I'm not mistaken. If I'm wrong somebody chime in. Oh by the way, the chemistry looks great from what you posted. Chl/CYA ratio is met almost perfectly.

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    Re: Another Newbie Chem question

    Yes....to reinforce what Dz7 says, get your alkalinity down to about 60 or 70. I too have an SWG and waterfalls/ribbons, and my pH even with aeration stays pretty rock solid between 7.5 and 7.8. But it took lowering my alkalinity to 70 to achieve.

    As for your CYA, granulated stabilizer can take a week or more to fully dissolve and test appropriately. If you've not had any rain or water exchange due to splashout/refill, then wait another week and test again before adding any more stabilizer. It's better to be cautious when adding.
    18' x 38' Pool, 3' to 8' Depth
    Vinyl Liner
    SWG
    Variable Speed Pump
    Sand Filter

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    Divin Dave's Avatar
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    Re: Another Newbie Chem question

    You aren't doing anything wrong, except perhaps expecting too much from the addition of a few lbs of CYA.
    Your spa waterfall will definitely effect the pH rise.

    Adding CYA will knock down the pH a little and the TA very little. Not enough to be very noticeable though.
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

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    Re: Another Newbie Chem question

    Thanks for the response!

    A lot of rain - yes
    Added CYA - granulated, directly through the skimmer (I learned later to use a sock)

    I'm pretty sure the water feature/ is not helping the situation. Unfortunately, there is no way for me to isolate the spa/ waterfall.

    - - - Updated - - -

    Thanks again for the replies.

    Also, I was reading that adding borates would help mitigate the swing in the pH which I believe is caused by the spa waterfall/ aeration. It seems like I'm adding acid daily just to ge the pH down to 7.6
    John
    Location: SW Florida
    Pool: In ground w/ spa water feature; 7,979 gals
    SWG
    Plaster/ pebble

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    Piolin's Avatar
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    Sep 2010
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    Miami, FL
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    Re: Another Newbie Chem question

    Have you contemplate adding borax, my TA is 70-80 and with borax my pH stay at 7.8 all the time
    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
    Pool School - Chlorine / CYA Chart

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    Re: Another Newbie Chem question

    My advice: get your TA down before you add borates. After you add them, it will be much harder to get the TA down if you need to.

    You may find that your Ph stabilizes when you lower TA to 60 or 70.

    Remember to pay attention to your CSI, though.
    50,000 gallon plaster in-ground salt pool with two 60 sq ft DE filters, two Intellichlor IC60 SWGs, two Intelliflo VS pumps, two Whisperflo pumps, two Pentair 400K BTU NG heaters, PCC2000 in-floor cleaning system...two everything.

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