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Thread: New Pool Owner - Different Chlorine Tests, Different Results

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    New Pool Owner - Different Chlorine Tests, Different Results

    Hi,
    I got the pool looking pretty good (a little dirt left to vacuum, but very clear water). I'm using a few different tests to try to make sure I'm not doing one wrong and relying on those results. So here's what I have:

    Taylor Basic from TF-100: Tests TC. At first registers 0.5-1. After several minutes, the color darkens to 3-6. There are no timeline instructions.

    DPD/FAS Test from TF-100: I find it important to let the powder stir for a few minutes to prevent adding the liquid reagent too soon. When I do this, I get a fairly consistent 4 FC and .5-1 CC

    Poolmaster 5 way Test Kit (came with the house- was outside all winter)- Instructions say 'within 2-3 seconds, compare color- this is FC. Wait 1-2 minutes and compare color- this is CC'. The pool tests at 1 FC/3 CC

    HTH 5 Way Test Strips (came with the house- was outside all winter)- No reading on the FC square, but if I dip it in bleach it doesn't read either- Defective, or does it not read chlorine in bleach somehow?

    None of these seem to correlate to one another. As I said, the water is quite clear (see picture). Any thoughts?

    DSC07516-1.jpg
    20000 gallon vinyl liner in ground pool
    16' X 34' rectangular diving pool
    Hayward Pro Grid DE Filter
    Hayward 1 hp Super Pump
    TF-100 Test Kit Stenner 45MPHP10

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    Mod Squad woodyp's Avatar
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    Re: New Pool Owner - Different Chlorine Tests, Different Results

    Trust the TF-100 results.......and you will even more with more testing experience. No need to "wait a few minutes"----just swirl and add your drops. Stips are worthless even without being outside all winter. Pitch the poolmaster as well if it's been outside.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

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    Re: New Pool Owner - Different Chlorine Tests, Different Results

    +1 what woody said.

    Use the Taylor K-1000 (it's the blue box in the TF-100) as a test for the presence of chlorine but not for accuracy. When you need accuracy, use the FAS/DPD chlorine test (with the powder).

    Toss the others.......they will only confuse you.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: New Pool Owner - Different Chlorine Tests, Different Results

    Thanks...That makes me feel better. How often do you test using the FAS/DPD method? Is it daily, or weekly as stated in the instructions? Also, how often do you add stabilizer?
    20000 gallon vinyl liner in ground pool
    16' X 34' rectangular diving pool
    Hayward Pro Grid DE Filter
    Hayward 1 hp Super Pump
    TF-100 Test Kit Stenner 45MPHP10

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    Mod Squad tim5055's Avatar
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    Re: New Pool Owner - Different Chlorine Tests, Different Results

    Quote Originally Posted by 440dodge440 View Post
    Thanks...That makes me feel better. How often do you test using the FAS/DPD method? Is it daily, or weekly as stated in the instructions? Also, how often do you add stabilizer?
    it all depends on what your "normal" FC should be based on your CYA level. Why my CYA was 200+ and I had to keep the FC around 20 the K1000 didn't get a lot of use because I needed the FAS/DPD to tell,me I was,in the correct neighborhood. Now that my CYA is down and my FC range is 4-6 I used the K1000 daily to doublecheck the color is bright yellow (5ish) and weekly I use the FAS/DPD to verify things.

    Generally the only way for,stabilizer to go down is to pump out water, so I only check It a couple of times a season. If you are in a rainy climate and pump,water out of the pool regularly you may need to add CYA every once in a while, but it's not common.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: New Pool Owner - Different Chlorine Tests, Different Results

    Quote Originally Posted by tim5055 View Post
    it all depends on what your "normal" FC should be based on your CYA level. Why my CYA was 200+ and I had to keep the FC around 20 the K1000 didn't get a lot of use because I needed the FAS/DPD to tell,me I was,in the correct neighborhood. Now that my CYA is down and my FC range is 4-6 I used the K1000 daily to doublecheck the color is bright yellow (5ish) and weekly I use the FAS/DPD to verify things.

    Generally the only way for,stabilizer to go down is to pump out water, so I only check It a couple of times a season. If you are in a rainy climate and pump,water out of the pool regularly you may need to add CYA every once in a while, but it's not common.
    Thanks...My CYA is in the 40 range, so I need the 4-6 FC. Do you also find you need to wait a few minutes for the K1000 to turn bright yellow or does it do it immediately?
    20000 gallon vinyl liner in ground pool
    16' X 34' rectangular diving pool
    Hayward Pro Grid DE Filter
    Hayward 1 hp Super Pump
    TF-100 Test Kit Stenner 45MPHP10

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    Mod Squad tim5055's Avatar
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    Re: New Pool Owner - Different Chlorine Tests, Different Results

    Quote Originally Posted by 440dodge440 View Post
    Thanks...My CYA is in the 40 range, so I need the 4-6 FC. Do you also find you need to wait a few minutes for the K1000 to turn bright yellow or does it do it immediately?
    put the drops in, a little shake and its immediate.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Casey's Avatar
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    Re: New Pool Owner - Different Chlorine Tests, Different Results

    As you start testing your water, you will start to understand your pools satiable diet for chlorine. As bather load goes up, your chlorine should too. For example... My husband and I are the primary users of our pool. I keep the pool at 5FC with a CYA of 40ppm. For the last 2 days, I've actually bumped my FC up to 8ppm because I've had an 8 yr old, a 15 yr old, a boxer and a Rottweiler in the pool. Heavy bather loads just require more FC.
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

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