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Thread: CYA/Chemistry question

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    CYA/Chemistry question

    Hi. Below are my numbers

    32K gallon SWG pool.
    New AquaRite t-15 running 60% 14 hours/day
    FC 3.2 Checked nightly
    PH Rises from 7.6 to 8.0 in about 4 days.
    TA 80
    CH 200
    CYA 40
    SALT 3100
    Borates 0

    Few questions.

    Do I really need to bring up my CYA to 70-80 if I can keep fc at 3 at only 60% run over 14 hours? What recommendations are there to get my PH rise to calm down. I know it is caused 100% from my SWG, because it recently broke and for a week I had no PH rise while I did dichlor (which got my CYA to 40). Expert at Leslie's is totally against selling me CYA and says 40 is great. Interesting because he isn't making money, but maybe he is hoping i'll have other issues that bring me back for more.

    Do I need to raise my CH from 200 to 300? It does slightly help my CSI, but the only way I can see to really keep my CSI in range is to keep a higher PH around 7.8. Recommended 7.5-7.6 gives me too big a negative on the CSI.

    How low should I lower my TA? Should I bring it down from 80?

    Last piece of info...my pool looks gorgeous and clear and sparkling, so I am not sure I should touch anything. I would like to add less Acid every week, and it wouldn't be bad to have the salt cell work less if I can.

    Any thoughts appreciated,

    Tony
    20' x 40' Plaster with 9' deep end, appx. 32K gals, Pentair Intelliflo VS pump, Hayward SwimPure t-15, 1 skimmer, Polaris 93 Robot, Pentair Mastertemp 400K BTU, iAquaLink wireless controller.

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    Mod Squad jblizzle's Avatar
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    Re: CYA/Chemistry question

    Welcome to TFP!!!

    Well, raising your CYA would allow you to run the pump and SWG less, saving money on electricity. It should also result in the cell lasting longer before you have to buy another one.

    You could work to lower the TA some which should slow the pH rise. Note that dichlor is acidic so it was certainly helping to hold the pH down.

    CH is fine if the CSI is reasonable ... with the number you provided ... even a pH of 7.5 should be an acceptable CSI (-0.5)

    Seems like you have a pretty good handle on things
    Jason, TFP Moderator
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    linen's Avatar
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    Re: CYA/Chemistry question

    Welcome to tfp, tpjenkins

    What kind of pool do you have (gunnite, vinyl, fiberglass)?

    I too would raise your cya to save on your cell.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: CYA/Chemistry question

    Thanks. I forgot to mention that every time I check my FC and CC levels I have a CC level of .2 (once in a while .4). The past 30 readings have showed me this...I am using the Taylor K2006 kit.

    I keep reading that it should be at 0...what is your recommendation to get me down to 0. The good news is that it has never been over .4.

    I have a gunnite pool with pebble tech.

    Regarding first question, I will go up to CYA of 60 and report back my findings. Thanks for the help.

    Thoughts?
    20' x 40' Plaster with 9' deep end, appx. 32K gals, Pentair Intelliflo VS pump, Hayward SwimPure t-15, 1 skimmer, Polaris 93 Robot, Pentair Mastertemp 400K BTU, iAquaLink wireless controller.

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    linen's Avatar
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    Re: CYA/Chemistry question

    CC levels below 0.5 can be ignored and considered normal. By the way, I would switch to using a 10 ml sample when doing the FC and CC test since you really don't need better than 0.5 ppm resolution.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: CYA/Chemistry question

    Anything under 0.5 for CC is fine. Mine is usually 0 but on occasionally it reads 0.5. No problems.

    You must me using the 25ml sample size. You can save some of your reagent if you go down to 10ml. Each drop then counts .5 in your calculations.
    23x40 freeform w/spa, 28,000 gal. PCC-2000 in-floor cleaning. Pebble Sheen w/flagstone coping. 14' weeping wall, (2) 18" sheer descents. Sta Rite- cart 400 sqft. filter, Intellipro VS pump, 1hp (cleaning)2hp (water feature)Max E Pro's. Easy Touch 8 function w/IPod. Rainbow chlorinator, Paramount Clear O3 (I know, I know), Max-E-Therm 400K heater.

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