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Thread: Initial, disturbing TF-100 measurements...

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    Initial, disturbing TF-100 measurements...

    My PB is supposed to balance pool. Still waiting for concrete to finish job. I haven't been home when he and his guys have added chemicals but I got this today:

    temp 86
    ph >8.2
    CYA 0
    CH 320
    TA 240
    Chlorine 0

    My salt generator displays red too low salt. They left me a bag of salt to add if light is on tomorrow. They added acid once but pH is still too high. I'm particularly concerned about TA level. Do I have to dump water from pool? The initial fill water had a lot of iron and I was told that by shocking pool several times that the iron was removed. I have no way of measuring iron. Can this be throwing other tests off?

    Water looks great but boy am I far away from the recommended levels posted here. What to do?
    Plaster pool inground 22,000 gallons with spa. Pentair Intelliflo, IC40 salt generator, WiFi control/Easy Touch.
    Hayward 1.5 HP pump on 750 gallon spa. Sand filters. Auto chlorinator on spa. Auto water level. Dolphin M500. TF100 XL with Speed Stir

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    Mod Squad Bama Rambler's Avatar
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    Re: Initial, disturbing TF-100 measurements...

    Just by adjusting the pH down with acid whenever it gets high will lower the TA. Don't worry about the TA worry about the pH and the TA will take care of itself. You really need to get some chlorine in there. The sooner the better. Add enough to get to 3ppm. Then you'll need some CYA in there. I don't know how much of Pool School you've read and understand but keep reading.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Initial, disturbing TF-100 measurements...

    Quote Originally Posted by Bama Rambler
    Just by adjusting the pH down with acid whenever it gets high will lower the TA. Don't worry about the TA worry about the pH and the TA will take care of itself. You really need to get some chlorine in there. The sooner the better. Add enough to get to 3ppm. Then you'll need some CYA in there. I don't know how much of Pool School you've read and understand but keep reading.
    The TA going down with pH correction was what I was really wondering about. We are adding salt to pool to get SWG running and I will add bleach to get chlorine levels up.
    Plaster pool inground 22,000 gallons with spa. Pentair Intelliflo, IC40 salt generator, WiFi control/Easy Touch.
    Hayward 1.5 HP pump on 750 gallon spa. Sand filters. Auto chlorinator on spa. Auto water level. Dolphin M500. TF100 XL with Speed Stir

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    Re: Initial, disturbing TF-100 measurements...

    Stabilizer arriving today. I have shocked and will get chlorine level corrected after stabilized.

    My pH is reading 8.2 plus with my new kit. I have added more than 3x the acid the pool calculator said is needed to get to 7.6. I'm now adding 6 oz at a time trying to get pH down using 31.45% muriatic acid. Is this the proper procedure? How much more acid should I reasonably expect to add?
    Plaster pool inground 22,000 gallons with spa. Pentair Intelliflo, IC40 salt generator, WiFi control/Easy Touch.
    Hayward 1.5 HP pump on 750 gallon spa. Sand filters. Auto chlorinator on spa. Auto water level. Dolphin M500. TF100 XL with Speed Stir

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    JasonLion's Avatar
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    Re: Initial, disturbing TF-100 measurements...

    The PH test will report any level above 8.2 as if it was 8.2, so you actually level might have been quite high. Also, with TA around 240 it can take a really large amount of acid to change the PH. You have the correct procedure, though you could easily add 16 oz at a time instead of 6 oz as long as TA remains above 200.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    XsAllOverIt's Avatar
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    Re: Initial, disturbing TF-100 measurements...

    With respect to your SWG, make sure you test the water to be in range with your SWG. I tested mine (Intellichlor) several times and was in the optimum range even though my SWG indicated LOW salt. Had to calibrate the SWG to get it to know where I was with the real measurments of salt.
    18 x 36 Inground Gunnite, White Plaster 21K gallon
    18" raised spa, 8' Diameter (620 gallon)
    Triton II Sand filter, Intellichlor IC40 SWG
    Pentair Pump, Max-E-Therm 400 BTU
    Lamotte ColorQ PRO 7-Plus test kit
    TFT-100 test kit

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    Re: Initial, disturbing TF-100 measurements...

    Quote Originally Posted by XsAllOverIt
    With respect to your SWG, make sure you test the water to be in range with your SWG. I tested mine (Intellichlor) several times and was in the optimum range even though my SWG indicated LOW salt. Had to calibrate the SWG to get it to know where I was with the real measurments of salt.
    Great advice. Wish I had gotten the salt test strips with my kit...
    Plaster pool inground 22,000 gallons with spa. Pentair Intelliflo, IC40 salt generator, WiFi control/Easy Touch.
    Hayward 1.5 HP pump on 750 gallon spa. Sand filters. Auto chlorinator on spa. Auto water level. Dolphin M500. TF100 XL with Speed Stir

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