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Thread: Did I misread my CYA?

  1. Back To Top    #1

    Join Date
    Aug 2016

    Did I misread my CYA?

    Hey guys, I already have another thread below this one but wanted to ask a separate question to not sidetrack the other one. I just got a Taylor test kit and I think I finally learned last night what I've been doing wrong with the CYA test for the past 2 days.

    On my first attempt I poured the mixed solution into the view tube. It filled all the way to the top and I could still see the black dot. BUT I WAS LOOKING AT IT FROM THE SIDE! Of course I could see it! So my newbie self thought my CYA was zero. But after further consideration I thought I could actually see only PART of the black dot so I changed my mind that my CYA was probably in the acceptable 20-40 range.

    So last night I decided to try again to see if it really was partially obscured. I got the same results....AGAIN LOOKING AT THE BOTTOM FROM A SIDE VIEW! And then about 2 minutes later I had my "Ohhhh" moment. I should have been looking at it from above, right? So I looked down from the top of the view tube (which was still full) and couldn't see the black dot. Of course, I was wondering if the solution would still give an accurate reading after a few minutes had passed. It couldn't hurt at this point so I shook out just a little bit of the solution and could then see the black dot.

    I will probably do another test this evening, although I really hate using up my bottle this quickly after purchasing. Can I trust my own "CYA reverse test", that by pouring out the full tube I can be pretty confident that the black dot would in fact have disappeared at some point along the way if I would have done the test correctly?

    Thanks so much for your help.
    22' Intex AG - 12K Gallons
    Model 633T Cartridge Pump
    August 17, 2016

  2. Back To Top    #2

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    Mr Bruce's Avatar
    Join Date
    Mar 2014
    Greenville, SC

    Re: Did I misread my CYA?

    The best way is to just pour it back into the squirt bottle and do it again. I usually do it 2 or 3 times to get an average.

    But to answer your question, yes you probably can use that as a close approximation to what you have. A retest would be best though.
    32K gallon Plaster - CircuPool SJ-55 SWG - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL/K-1766
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart - Support TFP

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