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Thread: 1st Time Shock / Daily Bleach Requirements

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    1st Time Shock / Daily Bleach Requirements

    Hello,

    I am a 7-year pool owner located in metro Atlanta, trying the BBB method for the first time this season. I would like to avoid Leslie's chemical route (think it's a ripoff, a visit to the store is always a haggle, bad customer service, etc.)

    I have been treating pool every other night with 6% bleach since opening a few weeks ago. Started with Clorox but now using the cheaper (50% less!) "Aldi Tundra" brand for the last week or so.

    I am having trouble maintaining any appreciable FC levels (always under 2 ppm) regardless if I add 1, or 2, or 4 96-oz jugs late in the evening. Pump runs overnight on the evenings I add bleach. The water appears clear and sparkling.

    Just came back from a complete water test from Leslies- I test FC/CC, pH, TA daily at home.

    Here is the current chemistry:
    FC/CC:0.5
    ph:7.4
    TA:70
    CYA:100
    Calcium Hardness:225
    TDS: 900
    Phosphates:100 ppb

    Leslie's recommendation:
    Fix TA via 11 lbs AlkalinityUP ($22)
    Shock with 2 lbs PowerPowderPlus ($9 if I buy (2)-1lb bags)

    Questions:

    1. The CYA/Chlorine chart says I need to operate b/w 7-12 ppm (CYA is 100), and for shock I need ~40 ppm, which is 22 of jugs bleach (22 @ $1.19 = ~$26) according to the PoolCalculator. Why shouldn't I buy the PowerPowderPlus ($9) and save $18- what is the cost justification of the bleach? Has Leslie's grossy underestimated the amount of chlorine I would need to shock, or am I misinterpreting the PoolCalculator recommendations?

    2. I would need $8 of baking soda from Wal-Mart for the same "effect" as the AlkalinityUp. Is the $15 difference worth it considering AlkalinityUP claims not to adjust my pH, but baking soda will?

    3. Under ideal / post-shock circumstances, how much bleach should I be adding to the pool daily? The PoolCalculator suggests 2+ jugs to raise 4 ppm, but my observations up to this point suggest this is not cutting it.

    Thanks for any/all feedback.
    Pool Info:
    25+ years old
    25K gal kidney shaped, in-ground
    Gunite, 1 skimmer, 2 returns
    DE filter, boost pump for polaris 360
    Heyward Chlorine Feeder (3" tablets) (off since trying BBB method)
    Filter runs ~8 hrs daily (8 AM - 4 PM)
    Polaris boost pump runs ~3 hrs daily (8-11)
    Pool in direct sunlight ~5 hours daily (11-4)

  2. Back To Top    #2
    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    Re: 1st Time Shock / Daily Bleach Requirements

    You have algae in the water, you just can't see it. When CYA is very high it is easy to get into a situation where there is enough chlorine to prevent the algae from ever getting out of control, but not enough chlorine to ever kill all of the algae.

    The common CYA test reads any level above 100 as if it was 100, so your CYA level might actually be much higher than you think it is. I strongly recommend that you lower CYA to something below 100 before trying to fight algae.

    To have the equivalent amount of chlorine from 22 jugs of bleach you would need 12 lbs of PowerPowder Plus, which would cost about $48 (varies a bit from store to store). The PowerPowder Plus would also add 28 ppm of calcium, which ins't a big deal in this situation.

    AlkalinityUp is exactly the same chemical as baking soda, exactly the same. Baking Soda is actually purer, which is good, though the difference is insignificant. Same effect on the water in every way.

    Once you kill the algae and get things under control, which requires properly shocking the pool, you should be using about 2 ppm of chlorine per day.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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  3. Back To Top    #3

    Re: 1st Time Shock / Daily Bleach Requirements

    Jason,

    Thanks for the informative response.

    As I understand it, in order to lower my CYA, I would need to partially drain the pool (try 20%) and then refill. Is this correct?

    -Greg
    Pool Info:
    25+ years old
    25K gal kidney shaped, in-ground
    Gunite, 1 skimmer, 2 returns
    DE filter, boost pump for polaris 360
    Heyward Chlorine Feeder (3" tablets) (off since trying BBB method)
    Filter runs ~8 hrs daily (8 AM - 4 PM)
    Polaris boost pump runs ~3 hrs daily (8-11)
    Pool in direct sunlight ~5 hours daily (11-4)

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: 1st Time Shock / Daily Bleach Requirements

    Yes, the only two ways to lower CYA are replacing water and reverse osmosis (only available in some areas).
    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

  5. Back To Top    #5

    Re: 1st Time Shock / Daily Bleach Requirements

    Would a good approach be: A) drain from deep end using my cover pump while simultaneously filling with hose at shallow side, and run filter as usual keeping current water level (for i.e. 24 hrs), or B) drain below skimmer level with filter off and fill afterward with hose (for 24 hrs)?
    Pool Info:
    25+ years old
    25K gal kidney shaped, in-ground
    Gunite, 1 skimmer, 2 returns
    DE filter, boost pump for polaris 360
    Heyward Chlorine Feeder (3" tablets) (off since trying BBB method)
    Filter runs ~8 hrs daily (8 AM - 4 PM)
    Polaris boost pump runs ~3 hrs daily (8-11)
    Pool in direct sunlight ~5 hours daily (11-4)

  6. Back To Top    #6
    Mod Squad Bama Rambler's Avatar
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    Jun 2009
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    SouthWest Alabama
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    Re: 1st Time Shock / Daily Bleach Requirements

    Plan A is the right one but don't run the filter pump. You don't want to mix the waters together during the drain / refill.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Mod Squad jblizzle's Avatar
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    May 2010
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    Re: 1st Time Shock / Daily Bleach Requirements

    You could also retest the CYA using a 50/50 mix of pool and tap water to start and then double the reading. This will give you a better idea how high it is and how much water should be replaced.

    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
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  8. Back To Top    #8
    harleysilo's Avatar
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    Mar 2012
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    North Georgia
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    Re: 1st Time Shock / Daily Bleach Requirements

    Good thing our water is relatively cheap here!

    I've also read about people getting a big tarp, placing it over the pool and weighing down the edges allowing for slack in the middle. Then as you drain water from the pool you replace it on top of the tarp, when you finish you slide the tarp out. Maybe over kill.
    18'x43' Sport Pool
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  9. Back To Top    #9

    Re: 1st Time Shock / Daily Bleach Requirements

    Thanks for all the additional responses. I'm in the process of replacing ~30% of my water, hoping to drive down my CYA level to ~70.
    Pool Info:
    25+ years old
    25K gal kidney shaped, in-ground
    Gunite, 1 skimmer, 2 returns
    DE filter, boost pump for polaris 360
    Heyward Chlorine Feeder (3" tablets) (off since trying BBB method)
    Filter runs ~8 hrs daily (8 AM - 4 PM)
    Polaris boost pump runs ~3 hrs daily (8-11)
    Pool in direct sunlight ~5 hours daily (11-4)

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