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Thread: High CYA + High CL = Metal Staining ?

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    High CYA + High CL = Metal Staining ?

    Do high levels of CYA plus high levels of Chlorine promote metals from coming out of water solution, thus promote staining?

    I ask because I "think" that's what the Pool Store told me after they tested my water. And I do have high levels of both. They definitely said High CYA...but I'm unsure if the High CL was the second part of the equation. Or perhaps the second part was referring to a different chemical level?

    I guess what I'm asking is, does High CYA + a chemical (low or high) {whether CL or not} = promotion of metals coming out of solution/staining?

    Thank you very much for your knowledge & help.

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    smforte's Avatar
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    Re: High CYA + High CL = Metal Staining ?

    If you have her sequestered metals, high chlorine, high ph will release them from a sequestrant. But pool stores aren't very accurate. Do you know you have metals, ie yellow stains, iron in water?
    Montgomery, AL
    27000 16 x 36 IG, Vinyl, Grecian, Hayward Sand filter, 1 HP Pentair whisperflo motor, Aqua Genie filter not by choice, no extra jets, Dolphin s300i robotic cleaner,Taylor K 2006 test kit, speed-stir which I couldn't live without!

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    Re: High CYA + High CL = Metal Staining ?

    Hi smforte! Thanks for your reply & help.

    Yes, I definitely have metals in the water and staining. Using this site, I knew to use ascorbic acid which worked well. Then once back in solution, I've been using the Walmart Metal Control in an effort to keep the metals in solution.

    But, what I really don't know is if some combination of chemicals actually can cause metals to come out of solution? That's what I gather in the Pool Store's statement that my high CYA and (something else...I think they said high CL) would make metal more easily come out of solution ....?

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    Re: High CYA + High CL = Metal Staining ?

    smforte, sorry but I didn't catch that you said high CL and high PH can cause metal to come out of sequesterant.

    But is High CYA involved at all? Or related at all to metal release, or anything else with metals?

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    smforte's Avatar
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    Re: High CYA + High CL = Metal Staining ?

    If your CYA is high you will need to have a higher FC level to keep up with the CYA level. High CL is what brings the metals out of being sequestered. How are you testing your water? Can you post your test results? Are you on city or well water? Also I'd recommend using a good seqestrant like Jacks Magic. You will have to replinish this every week or so.

    I have been battling metals for over a year. It ain't fun!

    Also please update your pool info in your profile so everyone can better assist you.
    Montgomery, AL
    27000 16 x 36 IG, Vinyl, Grecian, Hayward Sand filter, 1 HP Pentair whisperflo motor, Aqua Genie filter not by choice, no extra jets, Dolphin s300i robotic cleaner,Taylor K 2006 test kit, speed-stir which I couldn't live without!

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    Re: High CYA + High CL = Metal Staining ?

    It is the active chlorine (hypochlorous acid), more closely related to the FC/CYA ratio, that slowly oxidizes the metal sequestrant that would release metal ions back into the pool where they could then re-stain. The CYA level itself and the FC level by itself are not relevant. It's the active chlorine level. So a SLAM would oxidize metal sequestrant faster, for example.
    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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