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Thread: Question regarding Pool School suggested levels and Pool Math

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    aboykin2269's Avatar
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    Question regarding Pool School suggested levels and Pool Math

    Good morning everyone. I just tested my water for the first time yesterday evenning. First time pool owner.
    Here are my #'s
    FC 1.5
    CC 1
    PH 7.3
    TA 100
    CH 175
    HCL 3600

    So my questions is this: From Pool School the suggested levels are as follows:

    To summarize:
    FC 4-6 ppm
    PH 7.5-7.8
    TA 60-80
    CH
    • 50-300 for vinyl
    • 220-320 for fiberglass
    • 250-350 for plaster


    CYA 70-80
    Salt 200-400 ppm ABOVE recommended optimum level


    And Pool Math shows suggested FC leves for SWG at 2.
    SWG:2 Normal: 3 to 6 Shock: 12 Mustard Algae Shock: 19
    Suggested target FC levels based on the current CYA level for outdoor pools.
    Note: Be careful if your CYA is really and truly zero!

    So why the disparity? Which one do I need to shoot for (2 or 6) or am i miss-reading this?
    Ant
    16'x48" Summer Escapes Pro-Series, AG, Ultra-Frame, Intex CS15110 Sand filter/SWG, 5061 GAL, TF-100 Test Kit w/ K-1766 Salt Test and Speedstir.
    Pool School, ABC's of Water Chemistry, CYA/Chlorine Chart, Water Balance for SWG's, Pool Math.

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    Mod Squad JohnT's Avatar
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    Re: Question regarding Pool School suggested levels and Pool Math

    Those numbers in Pool Math are based on the value entered in the current value field for CYA. If you change that value to 80, the recommended levels will change too.
    TFP Moderator
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    aboykin2269's Avatar
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    Re: Question regarding Pool School suggested levels and Pool Math

    OH I see that now. So based on CC of 1 and FC of 1.5, I probably need to SLAM right? The water is cloudy and has a slight green tint.
    Also, I need to get my CYA up to 70 or 80 before beggining the SLAM, correct?

    Thanks,
    Ant
    16'x48" Summer Escapes Pro-Series, AG, Ultra-Frame, Intex CS15110 Sand filter/SWG, 5061 GAL, TF-100 Test Kit w/ K-1766 Salt Test and Speedstir.
    Pool School, ABC's of Water Chemistry, CYA/Chlorine Chart, Water Balance for SWG's, Pool Math.

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    TFP Guide
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    Re: Question regarding Pool School suggested levels and Pool Math

    If you are going to slam, wait to raise CYA. you will need less chlorine that way. After the slam you can up it. Also, they recommend turning off the SWG and manually adding the chlorine.
    26' X 52" Intex Ultra Frame. Intex Sand Filter
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    You can lead a horse to (clear) water, but you can't force him to swim in it!

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    Divin Dave's Avatar
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    Re: Question regarding Pool School suggested levels and Pool Math

    You need to slam.

    Leave your CYA where it is. The higher the CYA, the more chlorine you need to get to SLAM Level.

    Adjust your pH to 7.2 before you start.

    Read the slam instructions until you comprehend it. the 'm' in SLAM stands for Maintain. You need to maintain FC slam level until you pass all 3 criteria for completing it. If you hit it hard and stay on top of it the first 2 or 3 days, it will go by quick. If not, then it will just take a lot longer.

    Pool School - SLAM - Shock Level And Maintain

    Pool School - Chlorine / CYA Chart
    Divin Dave,
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    aboykin2269's Avatar
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    Re: Question regarding Pool School suggested levels and Pool Math

    Thanks. Another quick question Divin Dave. On the Chlorine CYA chart, for a SWG, they only list SLAM levels for CYA of 70 or 80. Do I use the Non-SWG chart for my SLAM FC level? Which would be 12ppm?
    Ant
    16'x48" Summer Escapes Pro-Series, AG, Ultra-Frame, Intex CS15110 Sand filter/SWG, 5061 GAL, TF-100 Test Kit w/ K-1766 Salt Test and Speedstir.
    Pool School, ABC's of Water Chemistry, CYA/Chlorine Chart, Water Balance for SWG's, Pool Math.

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    Mod Squad pooldv's Avatar
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    Re: Question regarding Pool School suggested levels and Pool Math

    Yes, use the non-SWG numbers for your SLAM.

    Here is a more in depth discussion for SWG water balance for after you finish SLAMing.
    Pool School - Water Balance for SWGs
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