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Thread: CYA/Chlorine and pool heater

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    Join Date
    Dec 2014
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    CYA/Chlorine and pool heater

    Hello All. Had my pool re plastered in the first part of May. At that time I decided to use a pool service to keep up my chemicals. Turns out they use pucks and liquid chlorine. Only being serviced once a week I started keeping track of CL and PH and saw wild swings in both during the week. I got rid of the pool service a week ago and will be doing my own service from now on using the TFP method. Got a TF100 kit and took some readings today:

    PH 7.5
    FC 4
    CC 0
    TC 4
    CH 450
    TA 70
    CYA 58

    According to the CYA/Chlorine chart, my CL target should be a little under 5. The manual for my brand new Raypac 407A states that the CL level should not exceed 5 or damage could result to the heater.

    Given this, what should my target CL be? I do not have a SWG.
    38000 Gal, IG, Plaster, 20' x 40' x 10', Attached Raised Spa, Intelliflo VS 3 HP (011018), Pentair Quad DE 60 Filter, Raypak (Rheem) 400,000 BTU (407a low Nox), Easy Touch 8 upgrade, Screenlogic 2 with wireless, IS-4 Spa Side Remote, Stenner 45MPHP10 w/15 gal tank, Intellibrite 5g (3), Dolphin Triton Plus robot with PRO remote, Water Tech Catfish handheld vacuum for spa, TF100 with SpeedStir.

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    Texas Splash's Avatar
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    Re: CYA/Chlorine and pool heater

    Hello Gary. Congrats on the TF-100. Already a sound investment for you. The target FC (free chlorine) for your pool based on the a current CYA of 60 is 7. Minimum is 5, so get some bleach in there ASAP.

    Hope this helps. Have a great day!
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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    Re: CYA/Chlorine and pool heater

    Follow this chart, Chlorine CYA Chart. The pool industry has ignored the relationship of FC/CYA and are stuck in their ways.
    16k gal plaster with raised spa, Jandy DEV60 filter, 2 HP 2-speed SHPF Jandy Stealth pump
    Hayward Aqua Rite T-15 SWCG, Jandy LXi 400k BTU NG heater, 350 sq.ft. of Sun Star solar panels, TF-100 Test Kit, Dolphin s300i Cleaner
    Test Kits . Pool Math . Chlorine/CYA Chart . The SLAM Process

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    Re: CYA/Chlorine and pool heater

    Thank you for the replies, I appreciate it. My basic question was about heater damage due to CL greater than 5.
    38000 Gal, IG, Plaster, 20' x 40' x 10', Attached Raised Spa, Intelliflo VS 3 HP (011018), Pentair Quad DE 60 Filter, Raypak (Rheem) 400,000 BTU (407a low Nox), Easy Touch 8 upgrade, Screenlogic 2 with wireless, IS-4 Spa Side Remote, Stenner 45MPHP10 w/15 gal tank, Intellibrite 5g (3), Dolphin Triton Plus robot with PRO remote, Water Tech Catfish handheld vacuum for spa, TF100 with SpeedStir.

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    bdavis466's Avatar
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    Re: CYA/Chlorine and pool heater

    Chlorine at that level will not harm your heater. I suppose issues could eventually arise with high levels of chlorine with no stabilizer (CYA).

    What can and WILL do far more damage to the heater is having a prolonged low pH. Copper is susceptible to erosion at pH levels below 7.

    I too am in Riverside
    -Brian-
    33K Pool/Spa, Pentair Equipment
    POOL BUILD
    Davis Custom Construction - Home Page

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    Re: CYA/Chlorine and pool heater

    The chlorine levels in the Chlorine / CYA Chart "Minimum FC" column have the same active chlorine (hypochlorous acid) level as 0.06 ppm FC with no CYA. The "Shock FC" column has the same active chlorine level as 0.6 ppm FC with no CYA. So these are far below the 5 ppm FC which the heater manufacturer specifies since they include pools with no CYA. So you need not worry about chlorine affecting your heater in a pool with CYA in it. As noted in the previous post, low pH is the most damaging to copper heat exchangers.
    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: CYA/Chlorine and pool heater

    Thanks for all the great replies. Makes me feel a lot better about raising my FC up to 7 without worrying about the heater. Thanks again.
    38000 Gal, IG, Plaster, 20' x 40' x 10', Attached Raised Spa, Intelliflo VS 3 HP (011018), Pentair Quad DE 60 Filter, Raypak (Rheem) 400,000 BTU (407a low Nox), Easy Touch 8 upgrade, Screenlogic 2 with wireless, IS-4 Spa Side Remote, Stenner 45MPHP10 w/15 gal tank, Intellibrite 5g (3), Dolphin Triton Plus robot with PRO remote, Water Tech Catfish handheld vacuum for spa, TF100 with SpeedStir.

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