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Thread: C.A. View tube question

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    C.A. View tube question

    Im new at testing chemicals so here it goes. Two nights ago we started the BBB as we just filled our pool. I have started with dichlor in the appropriate amount for the last two nights. I've been testing chlorine and ph nightly. Not sure if I'm supposed to check the cya yet or after the fourth night. So I just tested it and my question is about the black dot on the bottom of the test tube. Does it visibly go away from waist level? It never looked like it did but if I held it just in front of my eye, the blot dot was faded in the middle but not the edges. What should I be expecting with this? Thank you so much.
    28ft AG Doughboy Autumn Breeze, 1.5hp DB Powerline XP 1 pump, DB Sand Filter MM 1900 (19inch), Doughzone Generator (ozone purification), TF-100 test kit.

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    UnderWaterVanya's Avatar
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    Re: C.A. View tube question

    Even if your test unit doesn't look exactly like this - it works the same way.

    http://www.taylortechnologies.com/chemi ... ntentid=44
    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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    Re: C.A. View tube question

    What is important at this point is the calculated value for CYA. It may take a week or more for the CYA to show up on test so just keep a running total of what has been added. Use that calculated CYA for your values in the calculator and such until a week or so has passed, then test.

    I find that the lighting for this test is really important.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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    Re: C.A. View tube question

    I had the same thing. Just set up the pool on 7/22 and used the pool school recommendations and added 8oz of dichlor for four days. I tested CYA on day 5, and I got <20, when I thought it should be just above 30 based on the pool school article, and the pool calculator.

    So just for clarification, even when adding CYA by using dichlor, it will still take up to a week to register correctly on the test? I guess I assumed that was only for straight CYA, not for dichlor.

    Thanks.
    -hofmanns

    21' x 54" AGP w/abt 10500 gal.
    Hayward Sand Filter and Pump
    Installed Early summer 2015

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    Re: C.A. View tube question

    Keep in mind that depending on ambient light, your interpreted CYA value can be +/- 10 ppm.

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    linen's Avatar
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    Re: C.A. View tube question

    Quote Originally Posted by hofmanns
    So just for clarification, even when adding CYA by using dichlor, it will still take up to a week to register correctly on the test? I guess I assumed that was only for straight CYA, not for dichlor.
    CYA from dichlor shows up quickly.
    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: C.A. View tube question

    I tested twice, once indoors, and the second time outdoors in full sun, with my back to it. Both times I filled the tube, and could still slightly see the black circle at the edges. It never fully disappeared. Both tests were with Friday's water, so I will try again tonight or tomorrow with fresh pool water and see what I get.
    -hofmanns

    21' x 54" AGP w/abt 10500 gal.
    Hayward Sand Filter and Pump
    Installed Early summer 2015

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    UnderWaterVanya's Avatar
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    Re: C.A. View tube question

    How much dichlor have you added?
    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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    Re: C.A. View tube question

    I've added 32oz total.
    -hofmanns

    21' x 54" AGP w/abt 10500 gal.
    Hayward Sand Filter and Pump
    Installed Early summer 2015

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    UnderWaterVanya's Avatar
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    Re: C.A. View tube question

    Quote Originally Posted by hofmanns
    I've added 32oz total.
    32oz of bags? What percentage of dichlor is in each bag?
    If those bags were 100% dichlor you'd have about a 30 CYA ppm rise from where you started.
    (based on the 4000 gallons you list)
    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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    Re: C.A. View tube question

    It's 99% according to the active ingredient label, and it was from a container marketed for spa/hot tub sanitation "SpaGuard Chlorinating Concentrate" a BioGuard product.

    I expected about 30ppm rise, which is why I was surprised when I measured <20ppm.
    -hofmanns

    21' x 54" AGP w/abt 10500 gal.
    Hayward Sand Filter and Pump
    Installed Early summer 2015

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