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Thread: How do you test for chlorine

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    Whatrymes's Avatar
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    How do you test for chlorine

    I'm wondering how you all do your routine chlorine testing. Does anyone use the fas-dpd almost exclusively?
    . . .OR
    Which method do you use for routine checks, DPD?
    . . . OR
    OTO?

    I really enjoy testing with my TF-50's fas-dpd test. I'm wondering in the long run if that will be wise economically.
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    Re: How do you test for chlorine

    I have a hard time telling the shades of yellow apart so like you, I almost exclusively use the fas-dpd test. More expensive I'm sure, but I'd rather know for sure where I'm at. Interestingly, I have no such problem with the ph test.
    28K, 20' x 40' IG - Vinyl Liner, Hayward DE Filter, 1.5HP Pump, 250K Hayward BTU Heater, Aquabot Breeze 4WD robotic cleaner

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    Re: How do you test for chlorine

    I always use the dpd
    Gary
    21k gal SW, IG Gunite PebbleSheen, 1HP Jandy, Jandy 340 filter, Polaris 280, 17' fiberglass slide w/ 2HP pump.

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    Re: How do you test for chlorine

    FAS-DPD 2 or 3 times a week. I have to stare at the OTO test for quite a while to detect the shade, but I always do it first then run FAS-DPD to see how close I am. I'm getting better. I also tried with the DPD tester from an old Leslies kit, and I am much more accurate with that. I must be able to discern shades of pink better than shades of yellow.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Re: How do you test for chlorine

    one drop of OTO into the pool.
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    Richard320's Avatar
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    Re: How do you test for chlorine

    Quote Originally Posted by X-PertPool
    one drop of OTO into the pool.
    Since you're a pro, I figured you'd just scoop up a mouthful and swish it around.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: How do you test for chlorine

    That shade of yellow is difficult for me.
    I use the 2 part red shade daily, once a week or 10days I confirm w the FAS DPD
    The red is just so much more accurate for my eyes
    I get it at Leslies (unless I'm placing an order w our magnificent Duraleigh), Taylor R 0001 + R0002; it tests FC not TC, & you need that cell w the red on itnot the yellow OTO.

    I determined beyond a doubt that the chlorine savings FAR outweighed the 1part yellow OTO vs the 2 part red price difference.
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    Re: How do you test for chlorine

    I exclusively use the fas-dpd test everyday .
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    Re: How do you test for chlorine

    OTO = daily test.
    FAS-DPD = weekly test.
    chiefwej
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    Re: How do you test for chlorine

    FAS DPD every other day
    Viking Laguna 14K IG , Smart Pure SWCG, SwimClear C5520 Cartridge Filter, TriStar 1.5HP, SmartControl PLP4 controller.

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    Re: How do you test for chlorine

    Quote Originally Posted by Richard320
    Quote Originally Posted by X-PertPool
    one drop of OTO into the pool.
    Since you're a pro, I figured you'd just scoop up a mouthful and swish it around.

    Ok, that made me spit my coffee onto my laptop.

    I do both daily, I have a cya of 70 so I keep FC over 5 (usually 6-8 range) so I like that the DPD test is more accurate with higher levels of FC.
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    Re: How do you test for chlorine

    Ok, that made me spit my coffee onto my laptop.
    Ditto!

    I do OTO daily and FAS/DPD once weekly or so. Over the years, I have about learned just how much FC my pool uses so I find myself skipping the FAS/DPD test every now and then.

    (Refill customers...PLEASE pay no attention to the above statement...I was temporarily deranged)
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    Re: How do you test for chlorine

    fas dpd every other day, my pool numbers are pretty consistent so I add a certain volume of bleach on the "off" days and then test every second day, I find this reduces major drops in chlorine levels between tests. The tests usually come in at expected/consistent levels.
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    Re: How do you test for chlorine

    Quote Originally Posted by chiefwej
    OTO = daily test.
    FAS-DPD = weekly test.
    x2

    OTO to make certain pool is chlorinated and hasn't dropped drastically for some unexpected reason; FAS-DPD "roughly" every week or so when I want to know exactly how much chlorine I have, or in case of a pool party or if I changed pump run-times/swg percentage, etc.
    18k gal inground, everbrite finish, 505 sq ft; 1.5 hp two speed whisperflow; rheem 5100ti 100k btu heat pump; 3 sheer descent falls; DE filter; swg (cell out and using trichlor for now)

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    Re: How do you test for chlorine

    I've been keeping a log of my tests, for the most part I test 2-3 times weekly with DPD. If the weather changes then I will make sure to test.

    I'm sure both temperature and sunlight have an effect, does temp effect chlorine usage more than sunlight?
    Aaron
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    Re: How do you test for chlorine

    Only have the FAS-DPD test, so that is what I use. Probably every 2-3 days, unless there has been a change in the weather or bather load. Then it is every day.
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    Re: How do you test for chlorine

    DPD for routine checks. I find it pretty easy to tell right where I'm at, or at least close enough for government work. Maybe once a week with FAS-DPD, or when shocking (hoping I never have to do that again though!)
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    Re: How do you test for chlorine

    Quote Originally Posted by Richard320
    Quote Originally Posted by X-PertPool
    one drop of OTO into the pool.
    Since you're a pro, I figured you'd just scoop up a mouthful and swish it around.
    Funny thing, when I've been swimming around patching above ground pools in the past I could tell the customer "do you only use the tablets (tri-chlor) for your chlorine". They would usually say yes and I knew this because I would get some of the pool water in my mouth and the water would be so acidic from the tabs that it would make my mouth and teeth feel dry.
    -Kevin
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    Re: How do you test for chlorine

    I am obsessive about chlorine and do the DPD daily. After reading this however, Im going to try a drop of OTO once in a while for fun.
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    Re: How do you test for chlorine

    FAS-DPD only, since I have 60 CYA. So if the OTO can read it, then it's below minimum.

    I don't see how the OTO is actually useful except for SWG or very low CYA.
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