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Thread: Can't get chlorine up - not sure what to do

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    Can't get chlorine up - not sure what to do

    I've lived in our house with pool for over 7 years now. I've never had too much trouble maintaining it until now. Last year I had the pool painted with supposedly the best epoxy pool paint you can buy and had heard all the virtues of doing so. Our guntite was starting to look aged and I opted to do that as a cheaper option than a full replaster job.

    At any rate, I cannot seem to get things balanced now. I stumbled across this website and have already started buying chemicals from a local chemical company instead of the pool store. That has helped. I bought one of the recommended test kits and I've now managed to get the pH, TA, CH and CYA balanced pretty well. But I can not get the chlorine level to come up. At all!!!

    From the chemical company I bought a 5 gallon bleach container at industrial strength 12.5%. In an effort to get rid of an algae problem, my intentions were to shock the pool as advised. I ended up putting 3 gallons of the stuff in and it got the FC up to about 3 (when it should have raised it much higher). Laster in the day it was right back down to 0.5. Being out of bleach, I added 3 pounds of shock. This morning the bloody FC hasn't budged from 0.5. The pool is at least blue now (but terribly cloudy).

    I feel like I'm burning through chlorine so fast I'm concerned I'll end up spending a fortune and not getting anywhere.

    Let me know if you have any ideas. Thank you for this website and for any advice.
    25,000 Gallon
    In-ground, gunite - painted with a 20 year epoxy pool coating
    Use chlorine
    Knoxville, TN

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    JasonLion's Avatar
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    Re: Can't get chlorine up - not sure what to do

    Welcome to TFP!

    The first step is to post a complete set of water test results. What you think of as balanced and what we think of as balanced may not be the same thing. Then I suggest you do some reading in Pool School, especially the article on how to shock your pool.
    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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    Re: Can't get chlorine up - not sure what to do

    Thanks for your reply. I've read quite a bit in the pool school section over the past few days, as well as the section on shock.

    My levels are:

    pH: 7.3 to 7.4
    CH: 320
    CYA: 40-50
    TA: 110
    FC: 0.5
    25,000 Gallon
    In-ground, gunite - painted with a 20 year epoxy pool coating
    Use chlorine
    Knoxville, TN

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    Butterfly's Avatar
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    Re: Can't get chlorine up - not sure what to do

    Welcome to the forum

    Your #'s look fine - except, of course for the chlorine!

    You should start the shock process as outlined in Pool School.

    I suggest you use a shock level of about 20 FC. Try to maintain shock level as best as you can, especially in the evening and when the sun is off the pool. Only use bleach/liquid chlorine for the shock process.

    You have organics consuming the chlorine (possibly ammonia) at a fast rate.

    If you have questions, just post back here. Someone will be around to help.
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
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    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

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    Re: Can't get chlorine up - not sure what to do

    Yep. +1 what Butterfly said. You are going to have to keep adding chlorine and it will start to last longer and longer as it burns up the organics that are in your pool.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Can't get chlorine up - not sure what to do

    Okay, I'll make a run to sams club and load up on more bleach. Looks like its pretty much "all in" at this stage or turn my pool into a giant flower pot.

    Thanks for your help. I'll keep you posted.
    25,000 Gallon
    In-ground, gunite - painted with a 20 year epoxy pool coating
    Use chlorine
    Knoxville, TN

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    Join Date
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    Re: Can't get chlorine up - not sure what to do

    with pools..you are always "all in" or "all out"....LOL..no pun intended. GO big or go home. Do you have any type of chlorinator system, or maybe you want to possibly go with a SWCG...I find it very easy to maintain FC levels with either of those options.
    33' x 52" Swim and Play Inc. PARAGON AGP. Hayward H200 Heater. Hayward Power-Flo LX 1.5hp pump. Sta-Rite Cristal Flo T-210WF Sand Filter. Stenner 45M5 chlorine pump

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    Re: Can't get chlorine up - not sure what to do

    All I have ist the hockey puck dispenser. SWCG sound good, but finances are a bit tight at the moment.
    25,000 Gallon
    In-ground, gunite - painted with a 20 year epoxy pool coating
    Use chlorine
    Knoxville, TN

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    Re: Can't get chlorine up - not sure what to do

    Don't rely too much on that hockey puck dispenser either. Use it for vacations but otherwise use bleach.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Can't get chlorine up - not sure what to do

    On latest go-round, one hour after putting in more bleach, my FC is 13.5 and CC is 2.5. Adding more to bring FC up to 20
    25,000 Gallon
    In-ground, gunite - painted with a 20 year epoxy pool coating
    Use chlorine
    Knoxville, TN

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    Mod Squad jblizzle's Avatar
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    Re: Can't get chlorine up - not sure what to do

    Already you can see progress with the FC reaching higher levels. The high CC is a sign that something is using a lot of chlorine. Keep at it and follow the process until you pass all 3 criteria to stop shocking.

    Posted with Tapatalk ... sorry if I sound short ... hate typing on phone
    Jason, TFP Moderator
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    Re: Can't get chlorine up - not sure what to do

    Thanks for the encouragement and advise. Much appreciated.
    25,000 Gallon
    In-ground, gunite - painted with a 20 year epoxy pool coating
    Use chlorine
    Knoxville, TN

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    Mod Squad Bama Rambler's Avatar
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    Re: Can't get chlorine up - not sure what to do

    Keep after it as often as you can. It makes the process go faster and makes sure you don't lose ground. Losing ground is not something you want to do when shocking.
    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: Can't get chlorine up - not sure what to do

    Got it. I'll retest again within 2 hours. I've got quite a bit of bleach on hand now and can always make another run to the store tonight or in the morning if I need to.
    25,000 Gallon
    In-ground, gunite - painted with a 20 year epoxy pool coating
    Use chlorine
    Knoxville, TN

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    Re: Can't get chlorine up - not sure what to do

    I'm baffled. I just rechecked my levels. As you recall, this morning I had FC up to 13.5 and had added 2.8 gallons of 6% to bring it up to 20 (my CC was at 2.5). Now, a couple hours later, FC is not even registering and CC is at 1. I realize I need to dump a whole lot more in. But does this mean I am making progress because CC is lower now? Or am I fighting a losing battle?
    25,000 Gallon
    In-ground, gunite - painted with a 20 year epoxy pool coating
    Use chlorine
    Knoxville, TN

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    Re: Can't get chlorine up - not sure what to do

    Also, would it be better to hold off until evening or should I hit it hard again right now?
    25,000 Gallon
    In-ground, gunite - painted with a 20 year epoxy pool coating
    Use chlorine
    Knoxville, TN

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    Mod Squad Bama Rambler's Avatar
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    Re: Can't get chlorine up - not sure what to do

    Hit it right now and test again in an hour.

    Keep at it. You're making progress even if it looks like you're not. You're doing good that the CC's are going down.
    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

  18. Back To Top    #18

    Re: Can't get chlorine up - not sure what to do

    I'll do it now then. Thanks.
    25,000 Gallon
    In-ground, gunite - painted with a 20 year epoxy pool coating
    Use chlorine
    Knoxville, TN

  19. Back To Top    #19

    Re: Can't get chlorine up - not sure what to do

    FC: 12.5 - CC 0.5 - So it looks like the CC is getting depleted. Added more to theoretically bring it back to 20.

    Now I'm down to about 4 gallons of 6% so I better make a run this evening to get more. I'm considering buying stock in the company that makes Clorox. LOL.
    25,000 Gallon
    In-ground, gunite - painted with a 20 year epoxy pool coating
    Use chlorine
    Knoxville, TN

  20. Back To Top    #20
    Mod Squad Bama Rambler's Avatar
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    Re: Can't get chlorine up - not sure what to do

    I know right??

    Keep after it!
    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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