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Thread: What's my Cl and pH - color test included.

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    another one's Avatar
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    What's my Cl and pH - color test included.

    Hopefully a decent picture, white background, sun at my back. Two pictures of same sample. I took 8 pictures, half were out of focus and the ones with the sun shaded had reflections.

    Any ideas for getting decent pictures as well?

    Cl 5?
    pH 7.5?
    Attached Images Attached Images
    29,000 gallon, 18' x 44' Indoor plaster pool - 8'x'8 spa in corner. Well water, TF-100,
    pool cover, Pentair MasterTemp 400k btu heater, Jandy RS-4, 4 x 105 sq ft cartridge filters,
    Wisperflow WFE-4 1.0 HP pump for pool, WFE-6 1.5 HP pump for spa jets, MagnaSweep.

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    Re: What's my Cl and pH - color test included.

    This is my problem too. Sometimes I cannot really tell if my pH is 7.5 or not. The color does not match 7.2 and it is a little darker than 7.2 and 7.5 so I would record it as 7.6. The CC test is worse for me. The yellow colors for 2, 3, and 5 sort of blended together. The only time I can kind of tell them apart is when I hold it up agaist the PC monitor when the screen is white.
    IG pebbletec pool: size of pool: 27,000 gal; filter: cartridge - Hayward Superstar Clear; pump size: 1.5 HP; TF 100 Test kit - got it on 7-29-10; The Pool Cleaner-4-wheel suction model; Pool calculator: http://www.poolcalculator.com/; bleach calc: http://troublefreepool.com/files/BleachCalc262.exe

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    Henry Porter's Avatar
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    Re: What's my Cl and pH - color test included.

    IMO PH is easier to read than FC with this test. But I have callibrate my eyes with a droptest after each taylor in the beginning, so now I'm pretty sure I can trust my readings a bit better.
    I would say that your ph is 7,5, FC is harder to say from the pics but it looks to be up there where you've said.
    Inground concrete pool 14600 gallons,Pentair Whisperflo 3/4HP WFE-3, Hayward swimclear 420sq ft
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    Re: What's my Cl and pH - color test included.

    Obviously this test is subjective, but it is usually good enough for day to day readings. Get the TF-100 full test kit (there's a link in Pool School and many other places on this site) and use it every week to get accurate FC (and other readings). I have also "calibrated" my eyes against the TF-100 test for FC and agree that your FC is around 5 (as far as I can tell from the pictures). The test is only good up to 5 ppm and you might actually be a tiny bit higher. As far as pH, I guess you might be at 7.6 but that is perfectly fine.

    As far as pictures, don't waste your time. It's your pool and you need to control it. Unless you have a super-duper macro-focus camara with lots of pixels your eyes are going to be as good or better than anyone viewing on a computer screen. Get the test kit.

    It is much more helpful if you post your full set of readings, including CYA, to get the best advice. That's where the TF-100 comes in if you don't already have one. Very few of us trust pool store analysis.
    phil_d
    20,000 gal. vinyl liner pool
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    Re: What's my Cl and pH - color test included.

    The key to the pH isn't dark/light, it's yellow-ness/purple-ness. Yellow is acidic, purple is basic. You can add an extra drop of reagent to make it match more closely without messing things up too badly.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Re: What's my Cl and pH - color test included.

    Do you know what your CYA level is? If you're CYA level is 50 or more, you'll need to be targeting an FC level of greater than 5, therefore this test kit won't accurately tell you your FC level - it will max out at 5. Check out the Pool School on good test kits if you don't already have one. My CYA is at 60 and so I never even do the CL test that you show, and just do the FAS/DPD test included in my TF100 test kit.

    As for PH, the test you're running is the only option and I have the same issue as kal2002 where my reading is slightly darker than 7.5 but not quite 7.8 so I usually record that as 7.6. I know the instructions say to do it that way.

    Best advice I can give is to just keep testing every day, and after a while you'll find the right place to hold it up to a light source for best viewing and you'll become more comfortable reading your own results.
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    Re: What's my Cl and pH - color test included.

    Thanks for all the replies. I have a TF-100 and a speedstir, here's my numbers from a few days ago and 2100 gallons have been drained since then - I'm in the process or lowering my CYA by draining 700 gallons per day - we're on a well that does 3 gallons per minute with a whole house water softner, so I'm trying not to overload it. So far I've drained about 10,000 gallons.

    pH - 7.5? - see picture
    CL - I get 4.5 with the other test - so I expected to see 4 - 4.5 with the color test.
    TA - 85
    CH - 220
    CYA - 38 (estimate - lower than 40, higher than 30), was 55-60 when I started to drain, want to get it to 20-25 - indoor pool.
    29,000 gallon, 18' x 44' Indoor plaster pool - 8'x'8 spa in corner. Well water, TF-100,
    pool cover, Pentair MasterTemp 400k btu heater, Jandy RS-4, 4 x 105 sq ft cartridge filters,
    Wisperflow WFE-4 1.0 HP pump for pool, WFE-6 1.5 HP pump for spa jets, MagnaSweep.

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    Re: What's my Cl and pH - color test included.

    When I do the pH test, I actually look at the block caddy-corner to compare colors, somehow that removes some of the "it is so close but I can't decide" business. So in your photo I look at the color for 7.5 and compare it to the 2nd down sample (next to 7.8 color block). The shadows behind the vial make it tricky in the photo but even the top block (across from 8.2) looks more like 7.5 than anything else. Maybe higher or lower so I'd say 7.5 on the nose.

    As for FC, no way to tell for me. I'd use the drop test.
    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: What's my Cl and pH - color test included.

    One caveat about those photos. The color block I see on my screen is significanly off from the colors we see on the OTO test block in real life.....there is no purple at the 8.2 mark.

    Subsequently, I suspect the color of the pool sample within the test block is off as well.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: What's my Cl and pH - color test included.

    I am still confused when reading the pH. Seems like my sample always turns out to be much redder in color. When I was trying to get pH to go down to 7.2, my sample did not get that pale orangy color. It was pale but with more red. I just got done shocking at 24 FC. When FC came down to 9.5, I tested for pH and my sample was flaming red. I assumed that it was higher than 8.2 so I added some myriatic acid to bring it down. The question is: are we supposed to try to match the colors on the test block? pH at 8.2 is sort of purplish and I never anything but red red. Thanks.
    IG pebbletec pool: size of pool: 27,000 gal; filter: cartridge - Hayward Superstar Clear; pump size: 1.5 HP; TF 100 Test kit - got it on 7-29-10; The Pool Cleaner-4-wheel suction model; Pool calculator: http://www.poolcalculator.com/; bleach calc: http://troublefreepool.com/files/BleachCalc262.exe

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