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Thread: Water Testing

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    Fields's Avatar
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    Water Testing

    My pool hasn't been installed yet, but I want to test my fill water. I will be using tap water to fill the pool. My question is what should I test for, or do I test for everything? Thanks in advance for all responses.
    27x52 Garden Leisure AGP, Hayward Dream Line 1.5 Sand Filter, TF-100 Test kit
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    linen's Avatar
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    Re: Water Testing

    I am assuming you have a proper test kit? Test...TA, ph, CH. Skip the cya test, there won't be any. Are you on city water? If yes, then you may get a measurable level of FC and CC, which is normal. Are you on a well? If yes, then you may want bring a sample to a store that can check for metals. Even when on city water your can still have metals present, so it might be good to check on that source too.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Fields's Avatar
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    Re: Water Testing

    Yes I have the TF-100 test kit. I'm on city water. Once I check the chlorine, will it indicate how much bleach I will need once the pool is filled? I will be using the BBB method, thanks to this great forum!!
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    Mod Squad jblizzle's Avatar
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    Re: Water Testing

    You will need to learn to use the poolcalculator.com to determine how much of each chemical to add to acheive desired results.
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    Re: Water Testing

    Ok, I just completed my first water testing, yayy me!! I did everything the instruction card said to do. Keep in mind my pool hasn't been installed, just testing the water and getting used to my TF-100 kit. Here are the numbers.
    FC= 5
    TC= 8.5
    TA= 40
    CH= 40
    I didn't do the CYA test.
    I hate to be a bother, but what exactly does this mean? I think it means that I won't have to add bleach. Help please. Oh and I used the Pool Calculator and it said to add 211 oz (weight) or 169 oz (volume) of baking soda and 489 oz (weight) or 390 oz (volume) of calcium chloride. Can someone explain this? Thanks.
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    Mod Squad jblizzle's Avatar
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    Re: Water Testing

    Those are some surprisingly high FC and TC numbers for tap water ... these results seem suspect to me. Can you describe how you did the test?

    Your TA is a little low and the CH will be fine since you will have a vinyl liner.

    Did you do the pH test? Also do the yellow OTO test that is with the pH test and report those results.
    Jason, TFP Moderator
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    Re: Water Testing

    Quote Originally Posted by Fields
    Ok, I just completed my first water testing, yayy me!! I did everything the instruction card said to do. Keep in mind my pool hasn't been installed, just testing the water and getting used to my TF-100 kit. Here are the numbers.
    FC= 5
    TC= 8.5
    TA= 40
    CH= 40
    I didn't do the CYA test.
    I hate to be a bother, but what exactly does this mean? I think it means that I won't have to add bleach. Help please.
    Yowza! I bet that water tastes lousy with that much chlorine in it!

    You need to do the pH test as well. pH and TA are the critical ones to tell you how much acid or baking soda or borax you'll need to add. I'm guessing it's an above ground pool, so low CH doesn't really matter. That FC will be gone in one day as soon as the sun hits it, so prepare for that, too. Study Pool School and bookmark the pool calculator and you should be fine.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Re: Water Testing

    Quote Originally Posted by Fields
    Ok, I just completed my first water testing, yayy me!! I did everything the instruction card said to do. Keep in mind my pool hasn't been installed, just testing the water and getting used to my TF-100 kit. Here are the numbers.
    FC= 5
    TC= 8.5
    TA= 40
    CH= 40
    I didn't do the CYA test.
    I hate to be a bother, but what exactly does this mean? I think it means that I won't have to add bleach. Help please.
    No, you will have to add chlorine. The level in your city water will vary, and it will drop in your pool from various sources of demand. Organics and sunlight being the two primary causes of demand. Five PPM FC is really pretty high for drinking water, but that is the legal high limit in Texas. Likely where you are too.
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    Fields's Avatar
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    Re: Water Testing

    Quote Originally Posted by Richard320
    Quote Originally Posted by Fields
    Ok, I just completed my first water testing, yayy me!! I did everything the instruction card said to do. Keep in mind my pool hasn't been installed, just testing the water and getting used to my TF-100 kit. Here are the numbers.
    FC= 5
    TC= 8.5
    TA= 40
    CH= 40
    I didn't do the CYA test.
    I hate to be a bother, but what exactly does this mean? I think it means that I won't have to add bleach. Help please.
    Yowza! I bet that water tastes lousy with that much chlorine in it!

    You need to do the pH test as well. pH and TA are the critical ones to tell you how much acid or baking soda or borax you'll need to add. I'm guessing it's an above ground pool, so low CH doesn't really matter. That FC will be gone in one day as soon as the sun hits it, so prepare for that, too. Study Pool School and bookmark the pool calculator and you should be fine.
    Honestly I don't drink the water! I may have done something wrong. I try it again later. Thanks for all of your help.
    27x52 Garden Leisure AGP, Hayward Dream Line 1.5 Sand Filter, TF-100 Test kit
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    Re: Water Testing

    Report your pH and do the FC test once more. You likely had a testing error on the FC (that's common at first)

    Chlorine is a consumable item and will need to be constantly replenished in your pool.

    Your other parameters are fine for now.

    You are very wise to practice with the kit....you'll be an old pro by the time your pool is set up.

    It is very possible you may not need to add anything but CYA when you first fill. As you know, there is no need to test for CYA in your tap water because it has non.
    Dave S.
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    Administrator Leebo's Avatar
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    Re: Water Testing

    How many drops did you use to turn the water clear on the FC test??

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    Re: Water Testing

    I would still like to see the result of the OTO test ... if that is nearly clear, then there was obviously a problem with the FAS-DPD test method.
    Jason, TFP Moderator
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    Fields's Avatar
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    Re: Water Testing

    Ok I did the quick test and TC=3 and Ph= 8.2.
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    Re: Water Testing

    Lower you pH down around 7.4 with muriatic acid. That's the normal and you should never let it get above 7.8.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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