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Thread: New Pool Owner, Losing A lot of Chlorine

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    New Pool Owner, Losing A lot of Chlorine

    HI All,

    First off, thanks to everyone who contributes to this site. It has been extremely helpful as begin to figure things out with our new home and the pool it came with.

    The pool is pretty clean looking, clear water and nothing visibly wrong. I took apart and thoroughly cleaned the DE filter and the grids. It was pretty nasty and there were some small areas of visible green algae starting to form. Nothing overwhelming but present in areas. Now that it is clean, the pressure is in the 12 -13 range which looks to be normal based on markings by previous owner.

    My next step has been to try and balance the water. It has an in-line chlorinator (3" pucks) but after what I have read here, I am thinking to avoid the "shock" and puck products and go with liquid bleach from Costco. I have been having a **** of a time keeping chlorine in the pool which led me to believe something is hiding and growing somewhere and eating the chlorine. I got the chlorine levels up to ~22 or shock level (given CYA 75-80) only to see it drop off to around about 24 hrs later. My CC was 0.5 so I didn't expect a huge drop like this.
    I decided last night to and hit it hard and start officially a SLAM process and brought the chlorine level to 25ppm (around 8pm last night). I woke up this morning and measured only 11ppm chlorine. For such a clean looking pool, this seems extreme.
    I again put more bleach in this morning to bring it back up to around 24.5 and will check again in another hour or so to see where I am at.

    My CYA is between 75-80, pH around 7.5, and TA around 100.

    Is this much overnight chlorine loss abnormal for a pool with what I thought was a minimal issue?

    Thanks again for all the advice.
    23,000 IG Tile/Plaster
    48 sq ft Nautilus DE Filter
    Polaris 380

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    Mod Squad jblizzle's Avatar
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    Re: New Pool Owner, Losing A lot of Chlorine

    Welcome to TFP!!!

    Well you are almost on the right track. You certainly need to follow the ShockLevelAndMAINTAIN Process, but you are not raising your FC high enough. For a CYA of 80ppm, shock level is a FC of 31ppm according to the FC/CYA Chart and PoolMath.

    Pools can be deceptive. Even though clear, there must be something lurking in the water.

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    Richard320's Avatar
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    Re: New Pool Owner, Losing A lot of Chlorine

    What you're describing is not unheard of.

    In fact, I'd venture to guess that if your pool has been fed a steady diet of pucks, your CYA should be higher than 80. If it's not, maybe some of it decomposed into ammonia. Ammonia is a voracious chlorine consumer. It will neutralize bleach almost as fast as you can pour it in. Since the CC is low, you're probably through the worst of it. Take it up to shock level and brush everything. Don't neglect light fixtures and ladders and inside the skimmer throat.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: New Pool Owner, Losing A lot of Chlorine

    Thanks for the quick responses. Not sure why my first calc on SLAM level was lower but I will bring it up to the 31ppm level.

    I brushed the tile at the water line over the weekend and there was some small areas of algae, as well as the skimmer throat. Hoping I got most of that taken care of. I am thinking I need to pull the light fixtures from the wall as one of them has water in it and needs replaced. No ladders in this pool.

    Thanks for your advice!
    23,000 IG Tile/Plaster
    48 sq ft Nautilus DE Filter
    Polaris 380

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    frustratedpoolmom's Avatar
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    Re: New Pool Owner, Losing A lot of Chlorine

    Hi, if your CC is really only .5 then its probably not ammonia... but I agree with the above that you probably haven't shocked high enough and you have something "unseen" lurking. Follow the SLAM process to the T. What are you testing with?
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Re: New Pool Owner, Losing A lot of Chlorine

    I bought the TF-100 last week and just started using it. Great kit!
    23,000 IG Tile/Plaster
    48 sq ft Nautilus DE Filter
    Polaris 380

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    Re: New Pool Owner, Losing A lot of Chlorine

    Update:

    I took the FC levels up to 34ppm at 11:45am. By 2pm, the level had dropped to 27.5ppm. Loss of 6.5ppm in just over 2hrs - mostly in sun with pump running.
    I added 2 jugs of Clorox 121oz 8.25% to bring it up to around 34.5ppm. I will re-check here in about 2 hours to see how its doing.

    Note to self, buy stock in Costco and Clorox.
    23,000 IG Tile/Plaster
    48 sq ft Nautilus DE Filter
    Polaris 380

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    Re: New Pool Owner, Losing A lot of Chlorine

    Quote Originally Posted by schilsky View Post
    Note to self, buy stock in Costco and Clorox.

    I just bought a thousand shares of both since having the same issue, lol.
    2012 Gunite/Plaster, 33.5k Gal, No SWG, Tagelus Sand Filtration, UAC Regal 3/4HP Pump, TF100 Testkit w/stir plate.

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    Re: New Pool Owner, Losing A lot of Chlorine

    Quick question. As I am working through the SLAM process, do I need to be backwashing the filter at all? Pressure has not risen much at all, but not sure if it should be done regardless.

    Pool is looking good, clear water but still lost about 9-10ppm of chlorine last night (from 34ppm to about 24.5ppm this morning). I took the levels back up to 35ppm this morning and will retest in an hour or so. I pulled the pool light fixture out last night as well, and did notice some small green areas around the ring of the light.

    Is there a typical (I am guessing nothing is typical when it comes to pools) time frame it takes to eliminate the overnight chlorine loss?
    23,000 IG Tile/Plaster
    48 sq ft Nautilus DE Filter
    Polaris 380

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    DaninFLA's Avatar
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    Re: New Pool Owner, Losing A lot of Chlorine

    Quote Originally Posted by schilsky View Post
    Quick question. As I am working through the SLAM process, do I need to be backwashing the filter at all? Pressure has not risen much at all, but not sure if it should be done regardless.

    Pool is looking good, clear water but still lost about 9-10ppm of chlorine last night (from 34ppm to about 24.5ppm this morning). I took the levels back up to 35ppm this morning and will retest in an hour or so. I pulled the pool light fixture out last night as well, and did notice some small green areas around the ring of the light.

    Is there a typical (I am guessing nothing is typical when it comes to pools) time frame it takes to eliminate the overnight chlorine loss?
    if backpressure hasn't gone up, then no need to backwash. just keep an eye on it.
    Dan
    9,000 gallon in-ground Saltwater pool, plaster, cartridge filer, 1.0 hp pump, Hayward T-15 SWCG, TF-100
    Pool School - Chlorine / CYA Chart; Pool School - Test Kits Compared;

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    Mod Squad pooldv's Avatar
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    Re: New Pool Owner, Losing A lot of Chlorine

    The filter needs to be backwashed when the pressure goes up 20-25% from the clean pressure.
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