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Thread: A request for guidance

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    A request for guidance

    Good evening pool friends. I am hoping that I can pick your brains for some guidance about an issue I am having with my pool. My wife and I purchased our pre-owned home 6 months ago. The home came with an existing pool that was installed anywhere from 3-5 years ago. It seems that the pool wasn't well cared for by the previous owners. I live far from a pool store and have a basic test kit with a better one on order. Here are the problems I am having with my pool along with some actions taken.

    1) Pool has generator installed running at 90%. Chlorine continues to taper to zero within a day and a half of spiking it to ~5ppm with liquid bleach. The cell was completely clogged with deposits. I soaked it in a 1:5 water to acid solution. It took over an hour to dissolve the deposits. It is now clean, but the same drop in chlorine occurs.

    2) PH sits at a pretty solid 7.8. I can put 2 quarts of acid in and circulate. PH goes to 7.4 for the day and returns to 7.8 the following day. So far I have put in about 5 gallons of acid in the last 4 months. I am now following the TFP recommendation of dropping the pH to 7.2 and aerating back to 7.6.

    3) Pool has artificial rock on the deck that sits in in the water. There is a significant buildup of scale on the tile and rocks. I tried using a diluted muriatic acid (1:5) scrub. After 15 minutes I had cleaned 6 inches of water line to about 50% completion. I noticed the solution and scrubbing was removing the rock paint. I stopped.

    4) Unrelated to my cleaning attempts, many areas on the artificial rocks have either peeling or worn off paint. What is the best way to make them look good again?

    I had taken a water sample to the pool shop when we first moved in. The report I was given (which I cannot find now) stated that my CYA was high but acceptable. My pH was 7.8. My TC and FC were 0ppm. Salt was a bit low and I added some. Now my salt sensor tells me I have 3100ppm. Phosphates were almost non-existant. CH, I cannot remember the value, but I seem to recall he didn't balk at the result either. TA is currently 2200ppm.
    ~10k gallon IG pebble pool w/ 1HP motor and 460 sqft cartridge filter (150gpm)

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    JasonLion's Avatar
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    Re: A request for guidance

    You need to shock your pool. If you post a complete set of water test results we could give you much more specific advice.
    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: A request for guidance

    Quote Originally Posted by Kwantum
    Good evening pool friends. I am hoping that I can pick your brains for some guidance about an issue I am having with my pool. My wife and I purchased our pre-owned home 6 months ago. The home came with an existing pool that was installed anywhere from 3-5 years ago. It seems that the pool wasn't well cared for by the previous owners. I live far from a pool store and have a basic test kit with a better one on order. Here are the problems I am having with my pool along with some actions taken.

    1) Pool has generator installed running at 90%. Chlorine continues to taper to zero within a day and a half of spiking it to ~5ppm with liquid bleach. The cell was completely clogged with deposits. I soaked it in a 1:5 water to acid solution. It took over an hour to dissolve the deposits. It is now clean, but the same drop in chlorine occurs.

    2) PH sits at a pretty solid 7.8. I can put 2 quarts of acid in and circulate. PH goes to 7.4 for the day and returns to 7.8 the following day. So far I have put in about 5 gallons of acid in the last 4 months. I am now following the TFP recommendation of dropping the pH to 7.2 and aerating back to 7.6.

    3) Pool has artificial rock on the deck that sits in in the water. There is a significant buildup of scale on the tile and rocks. I tried using a diluted muriatic acid (1:5) scrub. After 15 minutes I had cleaned 6 inches of water line to about 50% completion. I noticed the solution and scrubbing was removing the rock paint. I stopped.

    4) Unrelated to my cleaning attempts, many areas on the artificial rocks have either peeling or worn off paint. What is the best way to make them look good again?

    I had taken a water sample to the pool shop when we first moved in. The report I was given (which I cannot find now) stated that my CYA was high but acceptable. My pH was 7.8. My TC and FC were 0ppm. Salt was a bit low and I added some. Now my salt sensor tells me I have 3100ppm. Phosphates were almost non-existant. CH, I cannot remember the value, but I seem to recall he didn't balk at the result either. TA is currently 2200ppm.
    Need the exact CYA level, high but acceptable isnt enough info
    17,800 gallon, IG pool, 595 sq feet (17x35x4.5 avg rectangle), Hayward 525 cartridge filter, diamondbrite, 2 hp 2 speed hayward tristar filter, Stenner 45mhp10 automatically chlorinating

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    Re: A request for guidance

    Will do. I will drive into town tomorrow and get an analysis done on a sample.
    ~10k gallon IG pebble pool w/ 1HP motor and 460 sqft cartridge filter (150gpm)

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    Mod Squad jblizzle's Avatar
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    Re: A request for guidance

    Quote Originally Posted by Kwantum
    Will do. I will drive into town tomorrow and get an analysis done on a sample.
    You'd be better served in the long run to purchase a good test kit as linked to in my signature. Pool stores are notoriously inconsistent and often incorrect.

    Posted with Tapatalk ... sorry if I sound short ... hate typing on phone
    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: A request for guidance

    Quote Originally Posted by jblizzle
    You'd be better served in the long run to purchase a good test kit as linked to in my signature. Pool stores are notoriously inconsistent and often incorrect.
    That is what I understand. I have a K-2006 on order, but it won't arrive for a couple more days.
    ~10k gallon IG pebble pool w/ 1HP motor and 460 sqft cartridge filter (150gpm)

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    Mod Squad jblizzle's Avatar
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    Re: A request for guidance

    Good deal. Hopefully it will show up quickly and you will have all the tools you need. The store results may at least put you on the ballpark, but I would not make major changes before you test yourself.

    Posted with Tapatalk ... sorry if I sound short ... hate typing on phone
    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: A request for guidance

    Ok. Gotcha. I am in Tucson (Vail really) as well. For a store test, which pool store would you prefer?
    ~10k gallon IG pebble pool w/ 1HP motor and 460 sqft cartridge filter (150gpm)

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    Mod Squad jblizzle's Avatar
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    Re: A request for guidance

    I am in the NW so not sure what is down your way. There are a lot of Leslie's in town but mostly in the north I think ... I do not have much to say about them although they do use drop tests. Since you are just looking for a quick sanity check what ever store is convenient is probably fine.

    Posted with Tapatalk ... sorry if I sound short ... hate typing on phone
    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: A request for guidance

    Quote Originally Posted by Kwantum
    Quote Originally Posted by jblizzle
    You'd be better served in the long run to purchase a good test kit as linked to in my signature. Pool stores are notoriously inconsistent and often incorrect.
    That is what I understand. I have a K-2006 on order, but it won't arrive for a couple more days.
    a magnetic stirrer is totally worth it
    17,800 gallon, IG pool, 595 sq feet (17x35x4.5 avg rectangle), Hayward 525 cartridge filter, diamondbrite, 2 hp 2 speed hayward tristar filter, Stenner 45mhp10 automatically chlorinating

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    Re: A request for guidance

    Well, the K-2006 took much longer than anticipated to arrive, but it is finally here. I went out and ran the battery of tests. Here are the results.

    CC: 0
    FC: 0
    pH: 8.0
    TA: 130ppm
    CH: 630ppm
    CYA: 115ppm (extrapolated)

    Original problem involved scale problems on artificial (painted) stone and tile, chlorine balance and pH issues. I also have green algae creeping in as of this morning.
    ~10k gallon IG pebble pool w/ 1HP motor and 460 sqft cartridge filter (150gpm)

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    JasonLion's Avatar
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    Re: A request for guidance

    The CYA test will report any level over 100 as if it was 100, so your CYA level could be just about anything. I suggest doing the CYA test on a mixture of half pool water and half tap water and then multiply the results by two. That will give you a rough idea if it is actually around 100 or more like 200+.

    Regardless, the first order of business is to get that CYA level down. There are two ways to do that, replace water, and a reverse osmosis treatment (not available in all areas). Either of those will also lower CH, which is also high.
    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: A request for guidance

    I diluted the water by half with the tap water. The doubled result is ~100ppm.
    ~10k gallon IG pebble pool w/ 1HP motor and 460 sqft cartridge filter (150gpm)

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    Re: A request for guidance

    I have the sump pump in the pool and am draining it 1/2 of the way.
    ~10k gallon IG pebble pool w/ 1HP motor and 460 sqft cartridge filter (150gpm)

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    Mod Squad jblizzle's Avatar
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    Re: A request for guidance

    Sounds like you over 200. Do the 50% drain/replace and then do the diluted test again. You will probably have to do at least 1 or 2 more 50% water changes to get your CYA manageable.

    Posted with Tapatalk ... sorry if I sound short ... hate typing on phone
    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: A request for guidance

    I think the actual value is probably near 100ppm. The diluted test result was 50ppm. Doubling this value is 100ppm. That's how this works right?
    ~10k gallon IG pebble pool w/ 1HP motor and 460 sqft cartridge filter (150gpm)

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    JasonLion's Avatar
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    Re: A request for guidance

    Correct, it just wasn't obvious if that was what you meant given the way you wrote it down the first time.
    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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    Mod Squad jblizzle's Avatar
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    Re: A request for guidance

    Sorry. I must have misunderstood. If you could get closer to a 60% water change that might be a bit better to start with.

    Posted with Tapatalk ... sorry if I sound short ... hate typing on phone
    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!

  19. Back To Top    #19

    Re: A request for guidance

    I drained about half of the water and just refilled it. Because of the algae growth, I did put some bleach in. Here are the results:

    FC: 0.6 ppm
    CC: 1.2 ppm
    pH: 7.8
    TA: 160 ppm
    CH: 510 ppm
    CYA: 60 ppm
    ~10k gallon IG pebble pool w/ 1HP motor and 460 sqft cartridge filter (150gpm)

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    Re: A request for guidance

    Have you used the pool calculator? It will tell you exactly how much you need to add.

    With the work you have done it is possible that your SWG (chlorine generator) is fine. Turn it down to about 50%, let the pump run and check it later to see if it is producing. If not then it may need a new cell which is not that big of a deal, better than buying a whole new unit.
    13,500 gallon IG Diamond Brite Super Blue, Pentair Superflo 1.5 HP 2 speed pump, 300 lb Hayward Sand Filter, Hayward Swim Pure+ SWG, Four 4X20 Fafco Solar Bears, Jandy Lite2 NG Heater, Borates, Blue Diamond Robot, TF100 & Refills, Taylor SpeedStir

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