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Thread: Chlorine dropped to zero

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    Chlorine dropped to zero

    Hi I opened my pool Tuesday. My cya was 30 ph 7.2 pool calculator had me add 355oz of bleach. Today mt cya is less than 20 and my chlorine is zero. What happened? At the end of last summer my cya was 180. Help please. Do I need stabilizer?
    36,000 gal IG vinyl. Haywood pump and heater Hayward DE filter blue diamond robot. Hayward Aqua Rite SWG AQR-15

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    Re: Chlorine dropped to zero

    When your pool is on a bleach diet, you need to check the FC on a daily basis and make the appropriate additions. You can't go several days without adding more chlorine, and there isn't a way around it unless you have an automatic feeder such as a Stenner or Liquidator, or go to saltwater chlorine generator.
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    Richard320's Avatar
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    Re: Chlorine dropped to zero

    That's actually pretty reasonable consumption for a pool the size of yours.

    You do need to feed it everyday.

    Raising the CYA level to 40 should slow down the loss, but it will still need a daily feeding, just not as much each time.
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    Re: Chlorine dropped to zero

    What test kit are you using? With a drop for CYA from 180 to 30/20 over the winter, that is a sign of potential ammonia problems.

    You need to be raising the FC up to 10ppm and then after 30 minutes test for FC and CC ... this requires the FAS-DPD chlorine test found in the Recommended Test Kits.

    Chlorine is a consumable and needs to be tested for and added every day.
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    Re: Chlorine dropped to zero

    I use the TF 100. Should I just add the recommended bleach and add stabilizer as well?
    36,000 gal IG vinyl. Haywood pump and heater Hayward DE filter blue diamond robot. Hayward Aqua Rite SWG AQR-15

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    Mod Squad jblizzle's Avatar
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    Re: Chlorine dropped to zero

    Add 10ppm of FC and test FC and CC in 30 minutes and report back.
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    Re: Chlorine dropped to zero

    Ok FC =2. Tc = 7
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    Mod Squad jblizzle's Avatar
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    Re: Chlorine dropped to zero

    I assume that is FC and CC? The FAS-DPD does not test for TC ... unless you added the FC and CC together.

    Anyway, that is a lot of CC and this is a sign of possible ammonia in the water. As such, the FC is going to be consumed very quickly. Continue to dose up to 10ppm and retesting every 30-60 minutes. Once the CC drop and the FC starts to hold, then you can consider adding some more CYA and continuing the SLAM Process.
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    Re: Chlorine dropped to zero

    Ok so today the FC is 1 and cya is below 20. The pool is just eating up chlorine. Time for stabilizer?
    36,000 gal IG vinyl. Haywood pump and heater Hayward DE filter blue diamond robot. Hayward Aqua Rite SWG AQR-15

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    pwrstrk's Avatar
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    Chlorine dropped to zero

    Quote Originally Posted by jblizzle View Post
    I assume that is FC and CC? The FAS-DPD does not test for TC ... unless you added the FC and CC together.

    Anyway, that is a lot of CC and this is a sign of possible ammonia in the water. As such, the FC is going to be consumed very quickly. Continue to dose up to 10ppm and retesting every 30-60 minutes. Once the CC drop and the FC starts to hold, then you can consider adding some more CYA and continuing the SLAM Process.
    Follow this advice. If you have ammonia it will eat chlorine like it's no body's business. 😎
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    Re: Chlorine dropped to zero

    So, after 1,089 ounces of chlorox dumped in pool since Wednesday , my readings are still zero chlorine. Do I keep adding till I get a reading ? Help!
    36,000 gal IG vinyl. Haywood pump and heater Hayward DE filter blue diamond robot. Hayward Aqua Rite SWG AQR-15

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    Re: Chlorine dropped to zero

    Quick answer is yes. Sounds like last year's CYA got converted to ammonia and it takes a fair amount of chlorine to get rid of the ammonia. Good news is that last year's CYA level was way too high so this might be saving you a drain/refill. Adding CYA too soon (or using stabilized chlorine - trichlor or dichlor) can be a problem because the bacteria suspected to convert CYA to ammonia might still be there and could turn your nice fresh CYA into more ammonia, so best to just keep adding bleach until the ammonia is gone, FC levels come up, and bacteria/algae in the water start dying.

    If you wanted some visible progress rather than feeling like you're pouring bleach into a bottomless hole you could hit a pet store and pick up an ammonia test kit then watch the ammonia levels come down (assuming that is the problem). I think the record here is 8ppm.
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    Re: Chlorine dropped to zero

    Thanks. I ran out of Clorox and could not get to Costco so I ( gasp ) went to a pool store and got some liquid shock. It's 12.5 % I think it's hypochlorite I haven't used it yet cause I used 300 ounces of Clorox this am. Is it a problem if I use the liquid shock ?
    Thanks
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    Mod Squad jblizzle's Avatar
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    Re: Chlorine dropped to zero

    It if the same stuff and may be a better deal depending on price. Add it if you need it, when you need it.
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    Still no trace of chlorine

    So after 10 days of pouring bleach into my pool, I still show no signs of chlorine. I've done everything that the forum suggested , to no avail. This is getting ridiculous. I never had this problem before. If it's ammonia, what else can I do? My cya was 24 and is Round that now. I am going to have a SWG installed next week. I can't keep lugging chlorine back from Costco. Don't know if that will solve the problem, but at least I'll have a constant supply of chlorine. Any thoughts out there?
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    Mod Squad jblizzle's Avatar
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    Re: Chlorine dropped to zero

    If you reported all the FC and CC measurements and dosing calculations, we would have had more insight. Did you get the water tested for ammonia? There is no magic cure. Chlorine always works.

    The SWG is not going to help.
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    Re: Chlorine dropped to zero

    I did the drop test. It shows no chlorine. ( water never turned pink)
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    Chlorine dropped to zero

    This is going to be a labor of love. Do you have this weekend to commit to the pool and the forum?

    If so go get a BUNCH of bleach or liquid chlorine. Post your full starting test numbers and what you plan to dose with.
    Rinse and repeat hourly.
    Let us guide you.

    An swg can't generate the volume of chlorine required to overcome ammonia, it will be consumed before it makes it out of the pipes and into the pool.
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    Re: Chlorine dropped to zero

    Ok will do. Off to buy more bleach. Thank you. I'm having people over tomorrow. Is is safe to swim. The pool is crystal clear and no algae
    36,000 gal IG vinyl. Haywood pump and heater Hayward DE filter blue diamond robot. Hayward Aqua Rite SWG AQR-15

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    Re: Chlorine dropped to zero

    Tough question to answer without a full set of test results.
    TFP Moderator Chris V. ~16K Pool & Spa, 48NSF DE, IG Plaster Circa 2000, Intermatic PE653, Challenger pump with a 2 speed B2984, 20gal stenner chlorine injection, Houston, TX
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