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Thread: Wanting to start Ascorbic Acid treatment... CYA Reading 0

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    IronKneebone's Avatar
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    Wanting to start Ascorbic Acid treatment... CYA Reading 0

    Hi Folks, Getting a jump on the new swim season and having a bit of Iron discoloring on my steps. The discoloring is just on one end of the steps, where the wind seems to blow everything in the one corner of the pool. The 2 White/Clean spots are where I've dropped 2 Vitamin C tablets

    pool 1.jpg

    The other end of the steps is nice and clean

    pool 2.jpg

    and The rest of the pool has clean plaster

    pool 3.jpg

    So I bought
    3 lbs of Ascorbic Acid
    New DE Filter set
    5 Quarts of Jacks Magic Blue Stuff


    I let the Chlorine lower and lowered the PH. Then this morning I decided to let the local Pool Store check my chemicals. The reason I did this is because I haven't checked the CYA for about 5 months (Ran out of Reagent 0013 and they have been out as well). They came back with similar readings as me except they told me the CYA was 0
    I bought a bottle of 0013 from them and sure enough, test reads 0 CYA
    I have kept the CYA at between 30-40 forever and now it's at 0
    I haven't been using anymore 12% bleach than usual ...weird

    My Plan (From the forum and Jacks Magic)
    Tomorrow when FC is at 1 or below
    Replace filters and add new DE
    While pump is running sprinkle Ascorbic Acid in trouble areas until stain lifts (I have 3 lbs)
    After stain lifts add 2 quarts of Jacks Blue Stuff (Sequestering Agent)
    Slowly raise FC
    PH on my pool rises naturly, so I will let nature raise PH
    Finally for preventive maintenance, add 8ounces of Jacks Blue Stuff every week for the rest of my life


    So my questions;

    Is it a problem having CYA at 0 if I'm not using the pool, it has good chemical reading and no algae?
    Can I revisit the CYA issue later, before swimming season starts?
    Where the heck did my CYA go?
    Does my game plan have any flaws?


    My readings;
    FC 2
    PH 7.0
    TA 80
    CH 400
    CYA 0
    Water Temp 58 degrees (tested CYA multiple times with water warmed to room temp)

    Thanks!!!
    15ft x 30ft IG Plaster 22,00gal - 7ft rnd Spa - Hayward 6020 DE Filter - Hayward 1.5 Tristar Pump - Kreepy Krauly Classic - Pentair S20 Skimmer

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    JoyfulNoise's Avatar
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    Re: Wanting to start Ascorbic Acid treatment... CYA Reading 0

    I would get your CYA up to a measurable level before doing anything else. If truly zero, then even 1ppm FC is way more harsh than we recommend.

    Also, you should use Polyquat-60 as insurance while the FC is zero to ensure algae can't get started. Just because the water is cold does not mean that algae is dead.


    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    IronKneebone's Avatar
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    Re: Wanting to start Ascorbic Acid treatment... CYA Reading 0

    Got it. Just bought 4lbs and have it in a sock in the skimmer. Hoping that the Zero reading is actually 15-20 and I'm just getting a super low reading.

    I didn't know that bleach was harsh on anything with a low CYA reading. I just thought that the CYA helped it last longer and protect the Bleach from the sun.... good to know
    15ft x 30ft IG Plaster 22,00gal - 7ft rnd Spa - Hayward 6020 DE Filter - Hayward 1.5 Tristar Pump - Kreepy Krauly Classic - Pentair S20 Skimmer

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    JoyfulNoise's Avatar
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    Re: Wanting to start Ascorbic Acid treatment... CYA Reading 0

    Read through some of the advanced chemistry topics. CYA protects against UV loss AND it is a chlorine buffer, meaning it bonds with the chlorine and holds it in reserve so that it only forms a small amount of hupochlorous acid which is the primary oxidizing and disinfecting form of chlorine. With no CYA, all of the chlorine turns into HOCl/OCl- which is what makes the water harsh. You need CYA to moderate the amount of HOCl/OCl- created.


    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    IronKneebone's Avatar
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    Re: Wanting to start Ascorbic Acid treatment... CYA Reading 0

    Will do, thanks Matt
    15ft x 30ft IG Plaster 22,00gal - 7ft rnd Spa - Hayward 6020 DE Filter - Hayward 1.5 Tristar Pump - Kreepy Krauly Classic - Pentair S20 Skimmer

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