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Thread: Pool will not hold chlorine

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    Pool will not hold chlorine

    Hi. My name is Bill. I have been reading around your site and just registered and decided to become a lifetime member. I also just ordered the TF-100 test kit today. My pool will not hold chlorine. I just got back from the pool store and here are the readings they gave me. I am getting very frustrated to say the least. Not to mention all the money going down the drain. Any help will be much appreciated.
    FC .2
    CC .6
    PH 7.2
    TA 85
    CH 150
    CYA 200
    19,000 gallons, In ground 16 x 32, Vinyl liner, Sand filter Hayward Pro Series S-244T (300 lb media), Pump Hayward 1 hp, Install March 1998, water test kit- TF-100 -- New Liner installed 07-07-2016 -- Mountain Top/Blue Mosaic by Kafko, Installed new 1 hp pump motor on 06-28-2017

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    Re: Pool will not hold chlorine

    Hi Bill and welcome aboard.

    The first thing I will tell you that you may not want to hear is to drain 60-75% of the pools water and fill with fresh water and bleach. That CYA is causing you all kinds of grief. You should be in the 30-40 range.
    18' x 36' vinyl steel wall pool with deep end, 2 lights and 6' steps, main drain, SWG, Cartridge Filter, 320,000 BTU Rheem heater, 3/4HP 1 stage pump - Ontario, Canada

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    Re: Pool will not hold chlorine

    Yeah, if that CYA test of 200 is valid (don't bet on it), you will need to drain some water. I seriously suggest waiting until you get yout TF-100 and test then.

    All CYA tests only go accurately to 100 so let's see what the TF-100 tells us. If the dot obscures before you reach 100 ppm, then you can dilute the sample 50% pool water and 50% tap water and re-run the test.

    I hope it will test lower than the 200 you got.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Pool will not hold chlorine

    Hi. Thanks for the welcome. This is Sherry, Bill's wife. Bill is draining the pool now. He is draining, then filling, draining then filling. Not draining the whole pool. Our pool has been in since 1998 so it is quite old. Pool builders and stores are always quite surprised that the liner has even lasted this long. Hopefully this will bring down the CYA. We are waiting for the TF-100 test kit and will test when it gets here. But he needed to get started on removing the water. It's supposed to be in the 100 degree range over the weekend or Monday and Tuesday. Is it strange that in 17 years we have never had this problem, then boom, won't hold chlorine all of a sudden? Bill is not sure what he wants to do when he gets the water balanced. Is it a lot more work, testing, and expense to use bleach instead of the chlorine tabs? I don't think we understand enough yet to make that decision. How often do you have to add bleach to the pool? Sorry for all the questions, but hard to do all this in between working and everything. Thanks for looking.
    19,000 gallons, In ground 16 x 32, Vinyl liner, Sand filter Hayward Pro Series S-244T (300 lb media), Pump Hayward 1 hp, Install March 1998, water test kit- TF-100 -- New Liner installed 07-07-2016 -- Mountain Top/Blue Mosaic by Kafko, Installed new 1 hp pump motor on 06-28-2017

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    Mod Squad jblizzle's Avatar
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    Re: Pool will not hold chlorine

    Welcome to TFP!!!

    Yes this is a typical story for tablet users ... things appear to be fine until suddenly they are not. This is due to the tablets adding FC and CYA and while the CYA builds up, the FC is consumed. As the CYA gets higher, you need a higher FC level to sanitize the water and keep the algae away. See the FC/CYA Chart.

    If you get a lot of rain and partially drain for the winter, then using the trichlor tablets can work ... since all the water replacement keeps the CYA level down. But, in other areas like AZ, TX, where there is not (usually ) a lot of rain and the pool is open year round ... trichlor is a very bad choice.

    You could certainly keep using tablets, but monitoring the rising CYA and switch to bleach when the CYA gets to the top of the recommended range.

    Have you discovered Pool School yet? Start with these:
    ABCs of Water Chemistry
    Recommended Pool Chemicals
    How to Chlorinate Your Pool
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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    Re: Pool will not hold chlorine

    Thanks! That was quick. How do you use the bleach to chlorinate the pool? I mean with the tabs, you just toss them in and they do their thing. How often do you have to add bleach? Sorry if the question seems silly. I have read some of the pool school links you added, but guess I am just not quite getting how much of the bleach is used and how often since the tabs are in the pool constantly.
    19,000 gallons, In ground 16 x 32, Vinyl liner, Sand filter Hayward Pro Series S-244T (300 lb media), Pump Hayward 1 hp, Install March 1998, water test kit- TF-100 -- New Liner installed 07-07-2016 -- Mountain Top/Blue Mosaic by Kafko, Installed new 1 hp pump motor on 06-28-2017

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    Mod Squad kimkats's Avatar
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    Re: Pool will not hold chlorine

    It is SO much cheaper to do it the TFP way! You are not going to believe how much money you save AND how good your pool looks!

    I "feed" my pool each night. It takes about 2 mins! Yeah! That is all! There are ways to make it automated. We can talk about that when you get your test kit and figure out what you want to do long term.

    WELCOME!

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: Pool will not hold chlorine

    Hi Kim! Thanks for the reply. So it is NOT more work or harder using bleach. So when you "feed" your pool each night, I'm assuming you're not adding a TON of bleach since it is a cheaper way then tabs. So you test your water every day?
    19,000 gallons, In ground 16 x 32, Vinyl liner, Sand filter Hayward Pro Series S-244T (300 lb media), Pump Hayward 1 hp, Install March 1998, water test kit- TF-100 -- New Liner installed 07-07-2016 -- Mountain Top/Blue Mosaic by Kafko, Installed new 1 hp pump motor on 06-28-2017

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    Mod Squad jblizzle's Avatar
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    Re: Pool will not hold chlorine

    Ideally you test your pool daily and add bleach to keep adequate FC levels. It is normal to lose about 2-3 ppm of FC every day. Given your pool is the same size as mine, I would guess you would need to add about 1/2 bottle of bleach every day.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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    Re: Pool will not hold chlorine

    I add about 2 quarts of bleach every evening....about 5 minutes spent per day. 2 quarts per day= about $10/week
    20000 gallon vinyl liner in ground pool
    16' X 34' rectangular diving pool
    Hayward Pro Grid DE Filter
    Hayward 1 hp Super Pump
    TF-100 Test Kit Stenner 45MPHP10

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    Mod Squad kimkats's Avatar
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    Re: Pool will not hold chlorine

    I am able to get chlorine at my local ACE Hardware store. It is 11%. I add about 100 oz. a night. My pool is has more water than yours so.........

    I test FC every night. The PH about 3 times a week. The other test once on the weekend. It is easy and kind of fun!

    I bought the test kit BEFORE I bought the pool to make sure I could do it! (long story for another time).

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: Pool will not hold chlorine

    Jason, do you use cheap bleach or buy the more expensive bleach?
    19,000 gallons, In ground 16 x 32, Vinyl liner, Sand filter Hayward Pro Series S-244T (300 lb media), Pump Hayward 1 hp, Install March 1998, water test kit- TF-100 -- New Liner installed 07-07-2016 -- Mountain Top/Blue Mosaic by Kafko, Installed new 1 hp pump motor on 06-28-2017

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    Mod Squad jblizzle's Avatar
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    Re: Pool will not hold chlorine

    I don't use bleach ... I have a SWG.

    But, you should use whatever is cheapest as a function of $/ppm of FC. You can use this: Liquid Chlorine Cost Calculator

    If you have a pool store that sells the higher strength stuff in bulk, that is usually the cheapest. Besides that, the 8.25% Walmart brand is usually reasonable.
    You also want to get stuff that is fresh and not sitting around out in the heat/sun like often the case at the large hardware stores pool's section.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    Re: Pool will not hold chlorine

    Thanks so much everyone. I have to get back to work but will have Bill read your posts. I'm sure we will have many more questions when we get our new test kit and try to get this water balanced.
    19,000 gallons, In ground 16 x 32, Vinyl liner, Sand filter Hayward Pro Series S-244T (300 lb media), Pump Hayward 1 hp, Install March 1998, water test kit- TF-100 -- New Liner installed 07-07-2016 -- Mountain Top/Blue Mosaic by Kafko, Installed new 1 hp pump motor on 06-28-2017

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    Mod Squad kimkats's Avatar
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    Re: Pool will not hold chlorine

    You know what? It is so nice to work with people who listen! THANKS for ordering the good test kit!

    It is going to be fun to watch your pool become the sparklie jewel in your backyard!

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: Pool will not hold chlorine

    +1^^^^^^

    And welcome.
    18*36*23 true "L" vinyl IG 29,000 gallons. SWG. TF-100 test kit.
    http://tftestkits.net/splash-page.html

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    Re: Pool will not hold chlorine

    Thanks Kim. The funny thing is our pool is very sparklie now. And thank you to you AimeeH also. Anyhow, just thought I'd throw some more numbers up that my husband just got from the pool store after removing and replacing a TON of water. They are listed below and posted the way they gave them to him:
    PH 7.4
    Free chlorine (1.0 PPM min) 0/0.2
    Alkalinity (120-150 vinyl) 110
    Hardness (200) 160
    Conditioner (20-100) 125

    The CYA is still so high! I wish we had the good test kit already. I think Bill is getting very frustrated.
    19,000 gallons, In ground 16 x 32, Vinyl liner, Sand filter Hayward Pro Series S-244T (300 lb media), Pump Hayward 1 hp, Install March 1998, water test kit- TF-100 -- New Liner installed 07-07-2016 -- Mountain Top/Blue Mosaic by Kafko, Installed new 1 hp pump motor on 06-28-2017

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    Mod Squad jblizzle's Avatar
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    Re: Pool will not hold chlorine

    Likely need to replace more water ... just remember it was all those trichlor pucks that got you into this mess.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    Re: Pool will not hold chlorine

    I hear you, Jason. He is pumping more water out right now. But it takes time and the pump is rented so it's not cheap. Do we want it between 30 and 50? So then if we get the CYA down, what's next? It's going to super hot over the weekend and through about Wednesday. About 100 to 104 degrees. Don't we need to get some chlorine in the pool now?
    19,000 gallons, In ground 16 x 32, Vinyl liner, Sand filter Hayward Pro Series S-244T (300 lb media), Pump Hayward 1 hp, Install March 1998, water test kit- TF-100 -- New Liner installed 07-07-2016 -- Mountain Top/Blue Mosaic by Kafko, Installed new 1 hp pump motor on 06-28-2017

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    Mod Squad jblizzle's Avatar
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    Re: Pool will not hold chlorine

    Once the CYA is confirmed to be in range (with your kit), then you need to start the SLAM process.

    Well, after testing everything to make sure nothing else is off.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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