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Thread: Water Tested - Now What

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    Water Tested - Now What

    I did what was recommended and drained 50% of my water and added new water. Went and had the water tested today and this is what it says:

    Temp - 70; CYA - 36; TC - .4; FC - 0; PH - 7.3; TA - 121; Total hardness - 308. What they recommend is 4lbs of shock. Should I enter this info in the pool calculator and just use bleach or liquid chlorine? How will I know if I need to add more? Thanks a bunch. This site is awesome!
    In-Ground L-Shaped Vinyl 40,000 gal
    Hayward S-240 high Rate Sand Filter 300lbs
    A.O. Smith Pump ST1102
    Pentair Chlorine/Bromine inline feeder Model 320
    *We liked the house, the pool came with it, we bought it, we win x2*

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    Mod Squad Bama Rambler's Avatar
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    Re: Water Tested - Now What

    It would be great if you could put your pool and equip info in your sig.

    You should enter the data in the Pool Calc and use bleach to shock the pool. You'll have to have frequent test results in order to perform the shocking properly. And you'll need a FAS-DPD test to know when you're done.
    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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    Re: Water Tested - Now What

    I am not sure how to put a signature on here but this is the info I know off hand:

    We have an In-Ground L-Shaped pool with Vinyl Liner. Hayward Sand Filter. After doing the LxWxAvg Depx7.5 our pool only holds 24,502 gallons. We were told 40,000. If you separate our pool into two rectangles they measure: 18x28 shallow end 3 ft; 25x18 deep end 8ft
    In-Ground L-Shaped Vinyl 40,000 gal
    Hayward S-240 high Rate Sand Filter 300lbs
    A.O. Smith Pump ST1102
    Pentair Chlorine/Bromine inline feeder Model 320
    *We liked the house, the pool came with it, we bought it, we win x2*

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    gboulton's Avatar
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    Re: Water Tested - Now What

    Quote Originally Posted by fivelittlegals
    I am not sure how to put a signature on here
    Top left, click "User Control Panel"
    Click "Profile" tab on left side.
    2nd item is "Edit Signature".



    We have an In-Ground L-Shaped pool with Vinyl Liner. Hayward Sand Filter. After doing the LxWxAvg Depx7.5 our pool only holds 24,502 gallons. We were told 40,000. If you separate our pool into two rectangles they measure: 18x28 shallow end 3 ft; 25x18 deep end 8ft
    Hrmm.

    I'm coming up with pretty close to 40,000 myself. 39,352.5 to be precise.

    18 * 28 * 5.5 (Average of 3 and 8) = 2772
    18 * 25 * 5.5 = 2475
    2475 + 2772 = 5247
    5247 * 7.5 = 39352.5
    -Gordon
    Pool School helps me maintain my 13,500G 24' x 48" ASP with Sand Filtration using a TF100 Test Kit and Pool Calculator.
    Remember, the Shock Process should be followed until : 1. CC is less than 0.5 ppm, 2. An OCLT shows a loss of 1.0 ppm or less and, 3. The water is crystal clear.
    --I didn't buy my pool to swim in it. I bought my pool to watch my wife swim in it. :wink:

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    Re: Water Tested - Now What

    See we were told to separate the pool into to rectangles and multiply by 7.5 separately. that gives us a totally different answer. Now I dont know what to believe.

    LxWxAvgDepx7.5

    you are saying to add the two totals together then x by 7.5
    In-Ground L-Shaped Vinyl 40,000 gal
    Hayward S-240 high Rate Sand Filter 300lbs
    A.O. Smith Pump ST1102
    Pentair Chlorine/Bromine inline feeder Model 320
    *We liked the house, the pool came with it, we bought it, we win x2*

  6. Back To Top    #6

    Re: Water Tested - Now What

    Oh the length of the deep end rectangle is 25 width is 18. you have 18x25, when its actually 25x18
    In-Ground L-Shaped Vinyl 40,000 gal
    Hayward S-240 high Rate Sand Filter 300lbs
    A.O. Smith Pump ST1102
    Pentair Chlorine/Bromine inline feeder Model 320
    *We liked the house, the pool came with it, we bought it, we win x2*

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    gboulton's Avatar
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    Apr 2012
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    Nashville, TN
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    Re: Water Tested - Now What

    In both cases, the answer is the same.

    2772 * 7.5 = 20790
    2475 * 7.5 = 18562.5

    20790 + 18562.5 = 39352.5

    And 18 * 25 = 25 * 18

    -Gordon
    Pool School helps me maintain my 13,500G 24' x 48" ASP with Sand Filtration using a TF100 Test Kit and Pool Calculator.
    Remember, the Shock Process should be followed until : 1. CC is less than 0.5 ppm, 2. An OCLT shows a loss of 1.0 ppm or less and, 3. The water is crystal clear.
    --I didn't buy my pool to swim in it. I bought my pool to watch my wife swim in it. :wink:

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    gboulton's Avatar
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    Apr 2012
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    Nashville, TN
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    Re: Water Tested - Now What

    Unless you're saying that the entire first rectangle is only 3' deep, and the entire second rectangle is 8' deep? That could change the math a bit.
    -Gordon
    Pool School helps me maintain my 13,500G 24' x 48" ASP with Sand Filtration using a TF100 Test Kit and Pool Calculator.
    Remember, the Shock Process should be followed until : 1. CC is less than 0.5 ppm, 2. An OCLT shows a loss of 1.0 ppm or less and, 3. The water is crystal clear.
    --I didn't buy my pool to swim in it. I bought my pool to watch my wife swim in it. :wink:

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