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Thread: Trichlor and no CYA

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    GreatCanadian's Avatar
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    Trichlor and no CYA

    Starting a friend on the BBB method. His pool is in its second season and he has used only Trichlor for sanitizing. Tested his water today:

    CYA = 0
    CL = 5
    CC = 0
    TA = 30
    CH = 50
    PH = 6.8

    What is it with the CYA. Ran the test with 3 different water samples. Started to wonder about bad reagent so I just tested my own pool water and CYA measures 70 as I would expect. His water is clear. Any explanation why CYA reads zero? Thanks.
    13'x22'x52" 8,000 gallon ProSeries Pool with Borates
    Intex 110 pound Sand Filter with Zeobrite, 2650 gph pump, 0.95 hp
    Bestway SWG
    AquaPro ECO500 50,000 BTU heat pump
    GLI Whirlwind Solar Cover Reel, TF-100 Test Kit

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    UnderWaterVanya's Avatar
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    Re: Trichlor and no CYA

    Had chlorine fallen to zero lately?

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    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

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    GreatCanadian's Avatar
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    Re: Trichlor and no CYA

    Don't know but I'm betting yes if CYA is actually zero.
    13'x22'x52" 8,000 gallon ProSeries Pool with Borates
    Intex 110 pound Sand Filter with Zeobrite, 2650 gph pump, 0.95 hp
    Bestway SWG
    AquaPro ECO500 50,000 BTU heat pump
    GLI Whirlwind Solar Cover Reel, TF-100 Test Kit

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    duraleigh's Avatar
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    Re: Trichlor and no CYA

    Before we jump into CYA eating bacteria (which it very likely isn't), what did he expect his CYA to be?

    To go back and try to reconstruct what he has and hasn't done to his pool is almost impossible. All kinds of possibilities but are all nothing more than guesswork unless he tells you everything he did and didn't do.

    I would simply bring the CYA up to where it need to be and get started clearing his pool.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    GreatCanadian's Avatar
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    Re: Trichlor and no CYA

    His pool is clear. And he knows nothing about CYA or the CYA/Chlorine relationship. His switch to BBB came from a suggestion from me. What I can tell you for fact is this:
    He has used trichlor for the past 2 seasons.
    He recently put pH reducer in his pool (too much according to my tests)
    And on a couple of occasions, he has noticed a LITTLE bit of algae around his ladder. He is gone to the store now to get CYA, borax, Muriatic acid, bleach, and baking soda.

    I guess I just won't wonder what happened to the CYA, and just be thankful that it isn't sky high!! I'll just balance his pool as it should be, and watch it for a few days. He'll have to get a good test kit, but in the meantime I will test for him.
    13'x22'x52" 8,000 gallon ProSeries Pool with Borates
    Intex 110 pound Sand Filter with Zeobrite, 2650 gph pump, 0.95 hp
    Bestway SWG
    AquaPro ECO500 50,000 BTU heat pump
    GLI Whirlwind Solar Cover Reel, TF-100 Test Kit

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    chiefwej's Avatar
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    Re: Trichlor and no CYA

    Yep, most converting to BBB have sky high CYA to deal with. Be glad that isn't the case. It's a lot easier to add it than get rid of it
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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    GreatCanadian's Avatar
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    Re: Trichlor and no CYA

    Here is a pic I took of the label. It's poor quality, but hopefully you can read it:
    Attached Images Attached Images
    13'x22'x52" 8,000 gallon ProSeries Pool with Borates
    Intex 110 pound Sand Filter with Zeobrite, 2650 gph pump, 0.95 hp
    Bestway SWG
    AquaPro ECO500 50,000 BTU heat pump
    GLI Whirlwind Solar Cover Reel, TF-100 Test Kit

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