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Thread: Water cleared, low readings

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    dw9000's Avatar
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    Water cleared, low readings

    I took a pH and FC sample, had almost no chlorine and about 7.8 to 8 pH. I added 2 gals of bleach. I took a reading 6 hrs later and the FC was up to about 4.
    Today I took another reading, and the FC is close to 1. I took the CYA,, and it is about 26 (according to the black dot test).

    According to the poolmath calculator, I need to add about 106 ounces liquid CYA and 1.5 bottles of bleach. Does it matter in which order and does one have to sit before adding the other?

    Thanks in advance
    In-ground block / vinyl liner 33' x 22' x 5',, approx 25k gals
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    Re: Water cleared, low readings

    Quote Originally Posted by dw9000 View Post
    I took a pH and FC sample, had almost no chlorine and about 7.8 to 8 pH. I added 2 gals of bleach. I took a reading 6 hrs later and the FC was up to about 4.
    Today I took another reading, and the FC is close to 1. I took the CYA,, and it is about 26 (according to the black dot test).

    According to the poolmath calculator, I need to add about 106 ounces liquid CYA and 1.5 bottles of bleach. Does it matter in which order and does one have to sit before adding the other?

    Thanks in advance
    Add the CYA first, because the higher CYA means you will need to target a higher FC. The liquid stuff will be active within minutes, certainly within hours, so you need to use the estimated CYA value as the now value and set the FC target accordingly.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    dw9000's Avatar
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    Re: Water cleared, low readings

    Quote Originally Posted by Richard320 View Post
    Add the CYA first, because the higher CYA means you will need to target a higher FC. The liquid stuff will be active within minutes, certainly within hours, so you need to use the estimated CYA value as the now value and set the FC target accordingly.
    Great thanks, that liquid CYA is kind of pricey,,, does this powder/crystal look ok? According to the amazon reviews, it is 100% cya I can use a sock and wait a bit longer....
    614C88SR6dL._SL1000_.jpg
    In-ground block / vinyl liner 33' x 22' x 5',, approx 25k gals
    Cartridge Filter
    Floor drains, 2 skimmers, 3 return lines (2" plumbing ultra-flex PVC)

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    Re: Water cleared, low readings

    The powder is fine, we suggest you hang it in an old sock in front of the return as it is very acidic and dissolves very slowly
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    Richard320's Avatar
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    Re: Water cleared, low readings

    Quote Originally Posted by dw9000 View Post
    Great thanks, that liquid CYA is kind of pricey,,, does this powder/crystal look ok? According to the amazon reviews, it is 100% cya I can use a sock and wait a bit longer....
    614C88SR6dL._SL1000_.jpg
    The granular is fine. So the target FC stays down at 3 until the sockful is dissolved, then it goes up.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    dw9000's Avatar
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    Re: Water cleared, low readings

    So do you suggest I add the CYA (hanging a sock in front of a return)? Let it all dissolve? Retest in a couple days,, then add the chlorine?
    In-ground block / vinyl liner 33' x 22' x 5',, approx 25k gals
    Cartridge Filter
    Floor drains, 2 skimmers, 3 return lines (2" plumbing ultra-flex PVC)

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    Re: Water cleared, low readings

    Quote Originally Posted by dw9000 View Post
    So do you suggest I add the CYA (hanging a sock in front of a return)? Let it all dissolve? Retest in a couple days,, then add the chlorine?
    You can add your chlorine while the CYA is hanging. Once it is all dissolved, dose your chlorine at the target CYA value. It may not show up on the CYA test right away, but it will be working. You should always keep your chlorine above the minimum for your CYA.
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    Re: Water cleared, low readings

    The chlorine needs to be added now to keep the water from going green. Chlorine and CYA work together very well. Target your FC as if the CYA is already in the pool.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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