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Thread: Pool Opening Chemestry Question

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    Pool Opening Chemestry Question

    I'm a newbie so please bear with me. I purchased the TFT test kit that was recommended and had the grand opening a few days ago. The water looked pretty good, better than in previous years. Did my first test and these were the results:

    Alkalinity - 110
    Calcium Hardness - 100
    CYA - 50
    Chlorine Drop Test - FC 1.75 and had no Combined Chloramines

    I've read through all the information but I'm still unsure of what to do next. The only thing I did after the test was add five large bottles of simple bleach and I plan to retest in a day or two. What should I be prepared to add? As I mentioned, the water looks pretty good from the start.

    IG - vinyl liner
    16' x 32'
    24000 gal
    Mineral Springs SWG
    1) 21,000 gallons
    2) Hayward cartridge filter with Super Pump
    3) Inground
    4) 16 x 32 vinyl liner
    5) Mineral Springs SWG

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    Re: Pool Opening Chemestry Question

    I am not an expert, but I seriously doubt that if your pool is 16x32 that it holds 23K or 24K gallons! I would expect it to be closer to 4K gallons. With a CYA of 50, you should be aiming for a FC level of 4 to 6 ppm. There is a chlorine / CYA chart here. What is the concentration of sodium hypochlorite in your bleach? How did you determine that you needed to add five large bottles? Five large bottles (if you are referring to 121 oz bottles) is 605 oz of bleach - assuming a 6% sodium hypochlorite level, that would raise FC by ~12 ppm in a 24K pool. I will defer to the experts here, but it seems like something is wrong with the math.

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    Re: Pool Opening Chemestry Question

    You can test again now for chlorine and also you need to check the PH. Use the chlorine test with the powder to check for FC and CC and post again. Be sure to use poolmath at troublefeepool.com/calc.html before you add chemicals to see what the effect will be.
    Mark
    IG plaster, 22,000 gallon, Jacuzzi Laser Sand filter

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    Re: Pool Opening Chemestry Question

    I would like to see your pH result as well. Post that up.

    Next, Did you use poolmath when you put in the five bottles or was that random?

    A 16 x 32 pool with and average depth of 4 feet will be around 16k. Tell us if you have a deep end or not.

    I'll reply again after you post back.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    JasonLion's Avatar
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    Re: Pool Opening Chemestry Question

    isaac737, a 16' round pool 32 inches deep would be fairly small, however I suspect that pixpicker has a 16' x 32' oval or rectangular pool, which could perhaps be as large as 24,000 gallons.
    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: Pool Opening Chemestry Question

    Quote Originally Posted by JasonLion View Post
    isaac737, a 16' round pool 32 inches deep would be fairly small, however I suspect that pixpicker has a 16' x 32' oval or rectangular pool, which could perhaps be as large as 24,000 gallons.
    Oops...you are right. Sorry, pixpicker.

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    Re: Pool Opening Chemestry Question

    And also... since you added that much bleach, make sure your FC drops below 10 when you check pH. FC above that makes the pH test unreliable.

    Test FC. If less than 10, check pH. Otherwise wait for FC < 10 then check pH and adjust.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

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    Re: Pool Opening Chemestry Question

    Thanks for the quick responses. I did add the 5 bottles of bleach randomly and I probably shouldn't have? You are also correct about the miscalculation of the pool size. It is a 16 x 32 rectangular with a deep end so it's probably just under 30,000 gallons. I'll try and do another test tomorrow but it may have to wait for the weekend.
    1) 21,000 gallons
    2) Hayward cartridge filter with Super Pump
    3) Inground
    4) 16 x 32 vinyl liner
    5) Mineral Springs SWG

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    Re: Pool Opening Chemestry Question

    Hold on, everyone, we are losing control on the gallonage. Let's get in agreement. A 16 x 32 x (use 5.5 for a deepend pool) 5.5 = about 21k.

    Let's not go further until we all agree and we all know how to figure it. (16 x 32 x 5.5 = 2816 cu feet x 7.5 gallons/cu ft = 21,120 gallons)

    I don't mean to sound the least condescending but we really need to be thinking the same thing. Post back.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Pool Opening Chemestry Question

    My error, duraleigh. You are correct. It's 21,120 gallons.
    1) 21,000 gallons
    2) Hayward cartridge filter with Super Pump
    3) Inground
    4) 16 x 32 vinyl liner
    5) Mineral Springs SWG

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    Re: Pool Opening Chemestry Question

    Ok, were are all lined up now! Since your pool looks pretty good and your other numbers all look good, about all you need to do is bring your chlorine up to around 6 ppm and then keep it there by replenishing it each time it drops as low as 4 ppm.

    Since you report FC as 1.75, let's get that right. Recall how many drops it took to get the solution from pink to clear and then multiply those drops times .5. The result cannot be 1.75 so rethink or redo that test and I'll help you with what to do next. This gets easier and easier.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Pool Opening Chemestry Question

    I plan on doing a complete retest this Sunday and will let you know the results. According to my notes, I added 35 drops to change the solution from pink to clear. Probably user error but the retest will confirm.
    1) 21,000 gallons
    2) Hayward cartridge filter with Super Pump
    3) Inground
    4) 16 x 32 vinyl liner
    5) Mineral Springs SWG

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    Re: Pool Opening Chemestry Question

    You listed the fc as 1.75, did you mean 17.5?

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    Re: Pool Opening Chemestry Question

    Got me again! The instructions state to multiply the number of drops by 0.5 but in the example it says to multiply by .05 to give the ppm. So if I read this correctly the FC is 17.5 or 1.75 ppm?
    1) 21,000 gallons
    2) Hayward cartridge filter with Super Pump
    3) Inground
    4) 16 x 32 vinyl liner
    5) Mineral Springs SWG

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    Re: Pool Opening Chemestry Question

    .5 is correct....that's a typo that has been corrected this year.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  16. Back To Top    #16

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    Re: Pool Opening Chemestry Question

    I just did the Cl/pH test - please see below. Looks like my chlorine is off the charts? Suggestions?
    Ph Chlor test 5-18-14.jpg
    1) 21,000 gallons
    2) Hayward cartridge filter with Super Pump
    3) Inground
    4) 16 x 32 vinyl liner
    5) Mineral Springs SWG

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    Re: Pool Opening Chemestry Question

    Your TC level is somewhere around 8 to 12, which is high but not really a problem. However, your PH looks to be quite low. I would raise PH to around 7.5 (or a little higher) as soon as practical.

    Does the water still look good?
    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

  18. Back To Top    #18

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    Re: Pool Opening Chemestry Question

    The water looks relatively clear but not sparkling. I have the Aquabot running now to clean the debris from the winter although the debris is modest compared to other years. Any suggestions about amounts to raise the pH would be helpful. I do not have the SWG running. When do you think that would be appropriate?
    1) 21,000 gallons
    2) Hayward cartridge filter with Super Pump
    3) Inground
    4) 16 x 32 vinyl liner
    5) Mineral Springs SWG

  19. Back To Top    #19

    Re: Pool Opening Chemestry Question

    What was your original pH and how much acid did you add?

  20. Back To Top    #20

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    Re: Pool Opening Chemestry Question

    That's the first time I tested for pH and the only thing I added was bleach.
    1) 21,000 gallons
    2) Hayward cartridge filter with Super Pump
    3) Inground
    4) 16 x 32 vinyl liner
    5) Mineral Springs SWG

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