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Thread: Test Questions

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    Test Questions

    Hi everyone,
    I'm using the Taylor 2006 FAS-DPD test kit.
    1. For my first tests on Monday I used the 25 ml sample line and had to add 37 drops of R-0871...so my FC is around 7.4? Seems too high, and I'm wondering what I did wrong?
    2. No combined chlorine was found, that's good, right?
    3. pH was 7.2
    4. Alkalinity was 80 ppm.
    5. Cyanuric Acid was 38 ppm.

    On Wednesday, I tested again with a 10 ml sample and got a FC reading of 4.5 ppm. Only a slight pink colour on the combined chlorine test, 1 drop to make it colourless.
    I realized that I my stabilized pucks had just run out, topped them up this morning. pH is 7.4.
    Everything seemed to be in order except my first test for FC. Any idea why it was so high/off? Thanks in advance, Flynn
    22K gal, IG, vinyl liner
    Hayward Sand Filter (model 244T)
    Hayward Pump
    Jandy Lite2 NG Heater
    Zodiac G3 cleaner

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    lefty51's Avatar
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    Re: Test Questions

    Hi Flynn, well everything else looks great. Did you by any chance check the chlorine at night or first thing in the morning and second test after the sun had been on pool all day ? That could explain FC drop.

    Remember the pucks will add CYA and raise PH, so use accordingly
    Si -central Mo. 32' x 16' -- 3'4" to 6' deep Vinyl liner - 16,500 Gals : Triton II filter -Duraglass 2 hp pump - 1 speed : SI-30 salt generator
    TF-100 with speedstir

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    Texas Splash's Avatar
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    Re: Test Questions

    Flynn, you may have already seen this page: Extended Test Kit Directions, but I wanted you to have it just in case. I always use the 10ml when I test, and just to confirm ... make sure after you add the power and swirl, that once you get your final drop count of R-0871, that you divide the total number in half (x .5). Example: It took 34 drops to change from pink to clear, then your FC = 17. I wasn't sure you did it that way from your explanation above. Just wanted to make sure.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

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    lefty51's Avatar
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    Re: Test Questions

    Quote Originally Posted by Texas Splash View Post
    Flynn, you may have already seen this page: Extended Test Kit Directions, but I wanted you to have it just in case. I always use the 10ml when I test, and just to confirm ... make sure after you add the power and swirl, that once you get your final drop count of R-0871, that you divide the total number in half (x .5). Example: It took 34 drops to change from pink to clear, then your FC = 17. I wasn't sure you did it that way from your explanation above. Just wanted to make sure.
    Good point TS, that would explain the difference. Also I always like to add that after you test for FC, if you let sample set a bit, it starts to turn back pink. So don't dally before testing for CC. I sometimes have a slight shade of pink that one drop clears, so I don't worry about it

    - - - Updated - - -
    Si -central Mo. 32' x 16' -- 3'4" to 6' deep Vinyl liner - 16,500 Gals : Triton II filter -Duraglass 2 hp pump - 1 speed : SI-30 salt generator
    TF-100 with speedstir

  5. Back To Top    #5

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    Re: Test Questions

    Quote Originally Posted by Texas Splash View Post
    Flynn, you may have already seen this page: Extended Test Kit Directions, but I wanted you to have it just in case. I always use the 10ml when I test, and just to confirm ... make sure after you add the power and swirl, that once you get your final drop count of R-0871, that you divide the total number in half (x .5). Example: It took 34 drops to change from pink to clear, then your FC = 17. I wasn't sure you did it that way from your explanation above. Just wanted to make sure.
    For the first test I used the 25 ml test line and had to add 37 drops, so 37 x .2 = 7.4, right? But maybe I took too long between testing FC and CC? I tested around 2 pm in the afternoon.

    - - - Updated - - -

    Quote Originally Posted by lefty51 View Post
    Hi Flynn, well everything else looks great. Did you by any chance check the chlorine at night or first thing in the morning and second test after the sun had been on pool all day ? That could explain FC drop.

    Remember the pucks will add CYA and raise PH, so use accordingly
    Hi Lefty51, thanks for the response. I have started to read the forums, but I haven't completed them all yet...your comment about the pucks above, is there something I'm missing, I thought I had to have some CYA going into my pool from my chlorinator?

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    Re: Test Questions

    This may be my dumbest day ever but I don't understand. Of course you will get different FC readings on different days......FC is constantly being consumed. I must be overlooking something?

    PS - FC of 7.4 is not necessarily high.....compared to what?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Test Questions

    Quote Originally Posted by duraleigh View Post
    This may be my dumbest day ever but I don't understand. Of course you will get different FC readings on different days......FC is constantly being consumed. I must be overlooking something?

    PS - FC of 7.4 is not necessarily high.....compared to what?
    Thanks Duraleigh, I thought FC of 7.4 sounded high because I've never had a reading from a pool store that was over 4.5...so I thought maybe I did the test wrong. Maybe I took too long adding the drops?

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    Texas Splash's Avatar
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    Re: Test Questions

    Hence why we try to remind folks the importance of owning their own test kit like you - to ensure your FC is in concert with your current CYA. That relationship is not emphasized at most pool stores. As long as your FC meets-up with your CYA per the Pool School - Chlorine / CYA Chart. you are in good shape. Always try to stay at your target, anything below as you can get into (algae) trouble. Have a great day.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

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    Re: Test Questions

    Ok TS, thank you. It seems from the chart on CYA & FC levels that if my CYA is around 40, then my minimum FC level is 3 and my target is 5. I'll try to keep those levels as I test daily over the next week or so.

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