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Thread: Chlorine reading going up?

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    Join Date
    Jun 2015
    Location
    Charlotte, NC.
    Posts
    82

    Chlorine reading going up?

    Hey all,

    I took a sample and tested (TF-100 powder test) about 15 minutes after my pump and swg stopped running and got a reading of 4 (8 drops). An hour later (no pump in the meantime, no SWG, plenty of sunlight around lunchtime) same spot/depth in the pool tested at 6 (12 drops). Any ideas? I have also noticed that if I take a reading in the afternoon/evening shortly after the pump stops, and again in the morning around sunrise (nothing is currently running at night) I also sometimes see a rise of 1-2 ppm in the test. If the difference was only a drop or two I would call it my error, but the difference is often 4 drops or more (2 ppm)

    Is this a striation/circulation issue with the pool? is it taking that long to distribute fully around the pool? Or does chlorine rise towards the surface and that's why my reading goes up after the water has been still for a while?

    Readings are always taken from the same spot in the deep end (6' pool depth). I put my hand in the water up to my elbow (about 1 foot deep) and fill the sample container from there.
    - Matrioux

    2007 18K pebble IG pool - Wincor Pool Systems automation & SWG (under development) - DE Jandy DEL60 Filter - Jandy 1HP Pump - TF-100 Test Kit

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    Join Date
    Jun 2015
    Location
    Glendale, AZ
    Posts
    156

    Re: Chlorine reading going up?

    I take all my readings, when all chemicals mixed well and 1/2 hr before the pump shuts off.....Consistent, repeatable, accurate
    Valley of the Sun, Arizona.....10k gunite/pebble (Re-surface March 2015) w/in floor Caretaker 99 cleaning heads -- Pentair FNS 60 DE filter -- Pentair IntelliFlo Variable Speed for pool -- Pentair Wisperflo 1 HP for boulder waterfall...Taylor K-2006 & Taylor K-2006C kits

  3. Back To Top    #3

    Join Date
    Jun 2015
    Location
    Charlotte, NC.
    Posts
    82

    Re: Chlorine reading going up?

    Problem with before is that my system is making chlorine so the reading will be high because of return jet location and circulation.
    - Matrioux

    2007 18K pebble IG pool - Wincor Pool Systems automation & SWG (under development) - DE Jandy DEL60 Filter - Jandy 1HP Pump - TF-100 Test Kit

  4. Back To Top    #4
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,994

    Re: Chlorine reading going up?

    Having an extra 1 or 2 ppm of FC isn't too big of a deal. There are only two options I can think of, run your pump to mix the water or brush the pool to mix your water. Take samples from a couple of places and use the lowest one to make sure FC is at target and doesn't drop below minimum.
    TFP Moderator
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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