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Thread: Chem levels--post pool refill

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    Chem levels--post pool refill

    Looking for insight into whether these readings are in acceptable ranges or not. TFP tool suggests adding stablizer and some acid to bring FC down. After refilling pool 2 weeks ago (copper exchange in heater ate up by low PH), I am leary of making many changes. I am new to pool chems, but need to do better staying on top of it.

    Pool is in part shade, in sunny Las Vegas. BTW, I have not put the heater back online, so water temp is around 45F now. Using 2 tabs trichlor, but used dichlor to bring FC up after fill. Also added 1.8oz soda ash at that time. No other treatments or chem adds have been done

    Testing with Lamote ColorQ Pro-7

    Chems-2-4-14.jpg
    2600 gal spool, IG fiberglass
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    Mod Squad jblizzle's Avatar
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    Re: Chem levels--post pool refill

    Welcome to TFP!!!

    First, I will just say that we do not put much faith in the ColorQ or any digital testers as there is no way to know if it is properly calibrated or just spitting out garbage.
    There is no way your CYA has swung from 3 up to 25 and back down to 16 ... that is just not possible. Your CH also could not have gone from 592 and down to 240 in one day and then back up to 318.

    The continued use of tablets will drive the pH and TA down and the CYA up ... this is not a good long term solution especially since you likely do not close your pool. You will need to switch to liquid chlorine.

    If you choose to believe these results ... There is nothing dire in your numbers, other than the FC being a little high for your low CYA level. But if you are going to use tablets for awhile, then the CYA will continue to rise.

    If you want to learn about the chemistry, read Pool School starting with:
    ABCs of Water Chemistry
    Recommended Pool Chemicals
    How to Chlorinate Your Pool

    And feel free to ask questions as they come up.

    BTW, were you using tablets before the heater went bad? How are you adding the tablets to the pool?
    Jason, TFP Moderator
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    pwrstrk's Avatar
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    Chem levels--post pool refill

    Welcome to TFP !!

    Jason gave you some good advice.

    Also here are the test kits that we recommend. I use the TF 100.

    http://www.troublefreepool.com/conte...its-comparison
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Isaac-1's Avatar
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    Re: Chem levels--post pool refill

    Like the others have said these numbers just don't make logical sense, CH and CYA can generally only be lowered through water replacement or reverse osmosis treatment (CYA will SLOWLY break down over time, but at a very low rate, below the typical testing errors, and on the scale of months or years, not days unless the pool has swamp like conditions). CH is always going to rise as it is left behind by evaporation and then raised by water addition until it gets so high that it forms scale. Trusting those numbers is like trusting the fuel gauge on a car that reads higher after you drive a hundred miles than when you started your trip.
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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    Re: Chem levels--post pool refill

    Thank you for the responses, good to learn new things (even as an old guy). I will look for a new test kit, even though I just bought the one I have. Pool store recommended, but that doesn't always factor as the best recommendation.

    Looks like I will change to liquid to clorinate going forward. Reading about it here, it seems a better alternative for my small pool than the trichlor tabs.

    To answer your question on prior use of tabs, I used a floating basket and used about 1 tab per week, with the temp maintained at about 82F. We turned it up for use but maintained the 82F when not using the pool (1x /week in winter). I must admit, I made the mistake to allow the chems to get so out of whack that it dissolved some of the copper from the heater exchanger. Two mistakes, actually. I used a very old test kit, and hadn't done a test in over a month. I also didnt maintain the chem levels for several weeks while I was out of town for work. Heat exchanger developed a crack and would no longer fire, but the discoloration of the water already told me what I didnt want to admit. Adding a chelating liquid turned water a not very nice blue.

    Sorry to ramble. But, figure if it helps others avoid my mistakes, then its worth the effort.
    2600 gal spool, IG fiberglass
    Pentair CC-150 cartridge filter
    Pentair IntelliFlo VS pump
    Pentair MasterTemp 250HDNA heater, with cupro-nickle exchanger
    2x swim jets

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    Patrick_B's Avatar
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    Re: Chem levels--post pool refill

    Welcome to the forum Dalancas!

    We all make mistakes and have let things get out of whack at some point. Sounds like the pucks took your pH down pretty low, and most people aren't aware they can do that.

    Important thing is taking a step in the right direction and it sounds like you are. Glad you found us, and hope you stick around.
    TFP Moderator
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    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
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    linen's Avatar
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    Re: Chem levels--post pool refill

    Welcome to tfp, Dalancas

    What was your reason for draining and refilling?
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: Chem levels--post pool refill

    Quote Originally Posted by linen View Post
    Welcome to tfp, Dalancas

    What was your reason for draining and refilling?
    Linen, the TDS was pretty high late last season so I had planned to drain the pool anyhow. The copper levels were very high from the erosion of the heater core as well, so it made me do it only a little sooner than I had planned.

    The cupro-nickel heat exchange shipped today, so I should get back to heated water sometime next week when it arrives.
    2600 gal spool, IG fiberglass
    Pentair CC-150 cartridge filter
    Pentair IntelliFlo VS pump
    Pentair MasterTemp 250HDNA heater, with cupro-nickle exchanger
    2x swim jets

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    linen's Avatar
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    Re: Chem levels--post pool refill

    Makes sense to reduce the copper levels if high, what were yours?

    TDS itself is really not important. However some of the stuff that makes up TDS (cya in particular) is.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Isaac-1's Avatar
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    Re: Chem levels--post pool refill

    Like Linen says TDS is a somewhat meaningless number, once upon a time before there was a separate test for CYA it may have been helpful, but these days it is nearly useless. TDS counts CYA, Salt, etc. all lumped into one number
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
    ~Remember TFP counts on your donations to keep this site ad free~

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    Patrick_B's Avatar
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    Re: Chem levels--post pool refill

    +1 to the above....

    TDS is absolutely useless if you don't know what is creating that number. Everything dissolved in the water contributes to it. You can assume a lot from TDS, but it really doesn't tell the whole story at all.
    TFP Moderator
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