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Thread: Pool looks great but won't hold chlorine

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    Pool looks great but won't hold chlorine

    Hey guys. I'm having a chlorine issue with my pool and I hope it's not algae starting to grow. My pool looks great but I'm having trouble keeping it at my target level of 5ppm. My level was at 5ppm last night and by 11am today it was down to 1ppm. Added bleach to get the level back to 5ppm and by 8pm it was down to 2.5ppm. Is this normal? Is it normal to add a full 96oz jug of bleach every day? Will doing a SLAM help? Here are my current numbers:

    FC=2.5
    pH=7.4
    TA=160
    CH=110
    CYA=40
    Temp=90

    I am currently using bleach but I did have a tri-chlore floater in there for about 2 weeks while I was on vacation. I also added about 60oz of muriatic acid today to bring the pH down from 8.0 to 7.4. I'm trying to get my TA down to about 100.
    17,500gal, 27' round AG, vinyl, clear water II cartridge filter on a Waterway Hi-Flo 48 Frame 2speed pump
    Taylor K-2006

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    Re: Pool looks great but won't hold chlorine

    What is your CC? I would do an Overnight Chlorine Loss Test. That will tell you for sure if you are in the early stages of an outbreak.

    Just my thoughts. Hopefully someone with more experience will jump in.
    12000 Gallon IG Plaster built 2/15/2014. Jandy 340 sg ft 127 gpm filter, Jandy 1 HP stealth pump. Circupool RJ-45 SWG (overkill). TF-100 with Speed Stir.

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    Casey's Avatar
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    Re: Pool looks great but won't hold chlorine

    Agree on the Overnight FC Loss Test.
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

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    Re: Pool looks great but won't hold chlorine

    Thanks for the replies. I just checked and FC is at 7.0 and CC is 0. I'll do the overnight test and see what happens.
    17,500gal, 27' round AG, vinyl, clear water II cartridge filter on a Waterway Hi-Flo 48 Frame 2speed pump
    Taylor K-2006

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    Re: Pool looks great but won't hold chlorine

    So last night FC was 7 and I checked again at 5:30 this morning and it was the same. From what I understand, this is a good thing and means I have nothing organic using up my chlorine. That being the case, the only other thing it can be is the sun...correct? My CYA is at 40 right now. Would bumping that to 50 help? I've also been reading that adding borax can help with chlorine consumption. Would it be enough to be worth the added cost and work?
    17,500gal, 27' round AG, vinyl, clear water II cartridge filter on a Waterway Hi-Flo 48 Frame 2speed pump
    Taylor K-2006

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    pwrstrk's Avatar
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    Re: Pool looks great but won't hold chlorine

    Going to a CYA of 50 could help. Not sure if the borates would be worth it. I've never went that route.
    Second thought. How much sun does your pool get ? My CYA level is 40 also and I target FC of 7. That gives more wiggle room for FC loss. I lose about 2-3 ppm a day. Pool gets 10-11 hours of full sun.
    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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    Casey's Avatar
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    Re: Pool looks great but won't hold chlorine

    How warm is your water? Warmer water uses up chlorine faster than say.... cooler water. I see you're in Florida.
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

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    Re: Pool looks great but won't hold chlorine

    Quote Originally Posted by Fieldsdj View Post
    So last night FC was 7 and I checked again at 5:30 this morning and it was the same. From what I understand, this is a good thing and means I have nothing organic using up my chlorine. That being the case, the only other thing it can be is the sun...correct? My CYA is at 40 right now. Would bumping that to 50 help? I've also been reading that adding borax can help with chlorine consumption. Would it be enough to be worth the added cost and work?
    In the hot Florida sun you will see more chlorine usage than other places. Raising th eCYA to 50 will help. But, before you do that is your current CYA reading recent or from before you used the floater for vacation? If the reading is from before, check your CYA again. If 40 is a recent number you can put the floater back in and let the CYA slowly come up to 50.

    You ask the question "Is it normal to add a full 96oz jug of bleach every day?" which begs a question in response, what is the chlorine % of the bottle. You will use more bottles of 5.25% than you will 8.25%. What is normal for my pool will not be normal for yours. Environmental factors play a big part of what is normal for your pool. Hours and intensity of sunlight, water temperature, organics getting into the pool and swimmer load are just some of the factors that will affect chlorine usage.

    Be very careful, because at the 2.5 FC level you are below the minimum 3 FC you need for 40 CYA. If you raise it to 50 CYA your minimum goes up to 5.

    Maybe you should consider some automation of chlorine dispensing, SWCG, Liquidator or Stenner pump. All provide a nice level addition of chlorine as the pump runs.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: Pool looks great but won't hold chlorine

    pwrstrk

    Going to a CYA of 50 could help. Not sure if the borates would be worth it. I've never went that route.
    Second thought. How much sun does your pool get ? My CYA level is 40 also and I target FC of 7. That gives more wiggle room for FC loss. I lose about 2-3 ppm a day. Pool gets 10-11 hours of full sun.
    My pool is in direct sunlight, no shade at all. I'd say 10-11 hours just like yours. I might try the borates, sounds like it has some good benefits for some. I'll raise my target as well, I like the idea of more wiggle room. Thanks.

    Casey

    How warm is your water? Warmer water uses up chlorine faster than say.... cooler water. I see you're in Florida.
    My water sits between 90 and 93 so I'd say that could be part of the issue. I plan on getting a fountain or something to try and get the temp down so we'll see if that helps.

    tim5055

    In the hot Florida sun you will see more chlorine usage than other places. Raising th eCYA to 50 will help. But, before you do that is your current CYA reading recent or from before you used the floater for vacation? If the reading is from before, check your CYA again. If 40 is a recent number you can put the floater back in and let the CYA slowly come up to 50.

    You ask the question "Is it normal to add a full 96oz jug of bleach every day?" which begs a question in response, what is the chlorine % of the bottle. You will use more bottles of 5.25% than you will 8.25%. What is normal for my pool will not be normal for yours. Environmental factors play a big part of what is normal for your pool. Hours and intensity of sunlight, water temperature, organics getting into the pool and swimmer load are just some of the factors that will affect chlorine usage.

    Be very careful, because at the 2.5 FC level you are below the minimum 3 FC you need for 40 CYA. If you raise it to 50 CYA your minimum goes up to 5.

    Maybe you should consider some automation of chlorine dispensing, SWCG, Liquidator or Stenner pump. All provide a nice level addition of chlorine as the pump runs.
    Very good questions, thanks tim5055. I'll check my CYA again...that reading was from right before vacation. I'm using 8.25% bleach at around $4 a bottle. I wonder, would the cheap Wal-Mart brand bleach be just as good?

    As far as environmental factors goes, the pool gets lots of direct sunlight which makes the temp in the 90's. I have 5 kids so they are in the pool a couple hours a day at least. I get lots of bugs in the pool so I keep the pump on almost all the time.

    I can see where all of these factors could cause my pool to just burn more chlorine. I'll look into automation for sure. I didn't even know that option existed. Do you or anyone else have any recommendations on automation of chlorine dispensing?
    17,500gal, 27' round AG, vinyl, clear water II cartridge filter on a Waterway Hi-Flo 48 Frame 2speed pump
    Taylor K-2006

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    Mod Squad tim5055's Avatar
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    Re: Pool looks great but won't hold chlorine

    Quote Originally Posted by Fieldsdj View Post
    Very good questions, thanks tim5055. I'll check my CYA again...that reading was from right before vacation. I'm using 8.25% bleach at around $4 a bottle. I wonder, would the cheap Wal-Mart brand bleach be just as good?

    As far as environmental factors goes, the pool gets lots of direct sunlight which makes the temp in the 90's. I have 5 kids so they are in the pool a couple hours a day at least. I get lots of bugs in the pool so I keep the pump on almost all the time.

    I can see where all of these factors could cause my pool to just burn more chlorine. I'll look into automation for sure. I didn't even know that option existed. Do you or anyone else have any recommendations on automation of chlorine dispensing?
    All of the things you are talking about will increase your chlorine consumption.

    The WalMart GreatValu is 8.25% also and is only $2.99. This is what I generally use. But I keep an eye on Target and a few other stores that I know have 8.25% because I sometimes pick it up cheaper. I keep saying I need to look at Aldi as I think theirs is less expensive.

    HERE is my Stenner install. Obviously human nature causes me to say what I decided to do is best, but honesty requires me to say all of the systems have their pluses and minuses.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    y_not's Avatar
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    Re: Pool looks great but won't hold chlorine

    Quote Originally Posted by Fieldsdj View Post
    So last night FC was 7 and I checked again at 5:30 this morning and it was the same.
    To do a proper OCLT, you need to raise your FC to shock levels, as if you were SLAMing your pool.
    Having run below the minimum for your cya, makes this a really important step for you.

    Re-check your cya level 1st, so you know where it is at.
    Read this 1st. http://www.troublefreepool.com/threa...l=1#post203524

    Also, you definitely need to be shooting for a higher FC target when you dose each day so you have more headroom. Plus it is a good idea to dose after sundown, as that gives the Cl maximum sanitizing power while the sun is down, and unable to consume any of it.

    A fountain, or other external areation source would definitely help to lower your water temp, but keep in mind that with this, comes pH rise, which requires the use of more ma.

    For getting your TA down, follow this. http://www.troublefreepool.com/conte...tal-alkalinity
    Basically lower with ma to target, then aerate to bring pH up, then hit it with ma again. Wash, rinse, repeat.

    Thanks for reading... - Tony
    Da' Pool: Intex 15'x42" 3284gal AGP EasySet (Inflatable Ring) - (Summer 2014: 27' round EW /w 6.5' deep end @ 22,500gal)
    Pump & Cart Mod: 1000gph Cart. 5ft² - 2 nylons, 24/7 OP. Traps bugs/bits, lasts longer/cleans easier = Happier Pool Owner!!
    The Bible for a "Trouble Free Pool" life = PoolSchool, the BBB method a TF100 test kit(Recommend Kits Compared). - Cleaning a Sand Filter
    Water looks like GLASS, if yours doesn't...SLAM IT! Feels nice and never been happier!!! :D

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    Casey's Avatar
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    Re: Pool looks great but won't hold chlorine

    I would definitely look into a way to cool your water and even run the pump at night to help in cooling it. I can't even get my pool to stay at 80 degrees this year without the temps doing a nose dive on me! We're at 50 degrees night time air. lol
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

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