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Thread: Newbie-Is my chlorine level safe to swim

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    Newbie-Is my chlorine level safe to swim

    Hello everyone, I recently purchased the TF 100 test kit and have the the following results. I would like to know if the chloring levels are safe to swim. Thanks for you help in advance.

    FC - 18
    TC - 18.5
    pH - 7.5 -7.8
    TA - 90
    CH - 510
    CYA - Recently added 4 lbs. waiting a few more days to test
    Salt ppm - 3500 ppm
    1) 20,000 gallons
    2) Pentair DE Filter
    3) IG (in ground)
    4) Pebble
    5) 20 flow rate
    6) Believe pool was built in 2003
    7) Salt Water Pool

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    duraleigh's Avatar
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    Re: Newbie-Is my chlorine level safe to swim

    4 lbs of CYA in a 20k pool results in CYA of 25ppm. Shock value (safe to swim) for 25ppm CYA is about 12 ppm so you should let FC come on down to about 12ppm and then you are good to go.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    linen's Avatar
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    Re: Newbie-Is my chlorine level safe to swim

    Welcome to tfp, jonavarro26

    Duraleigh beat me...but here is my take:

    What was your cya level before adding the new stuff?

    Our guidelines for safe swimming are up to your FC level, but you need to know what cya level you have to know your FC level. Use:http://www.troublefreepool.com/pool-...ya_chart_shock or poolcalculator.com to get your FC shock level.

    Also, you should be able to see the bottom for safe swimming.
    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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    Re: Newbie-Is my chlorine level safe to swim

    Thanks duraleigh. How can I reduce the chlorine in a couple hours? I just lowered the output on my t-cell to 30p would this help? Or would you recommend I buy chlorine neutrilizer?.

    Thanks for the welcoming linen, I had added 4 lbs 2 weeks before. I did the CYA test a week later and I could still see the black dot. It was cloudy so I figured there was CYA but it was below 20. On the chart you referred me to is the FC Shock, the maximum chlorine allowed??
    1) 20,000 gallons
    2) Pentair DE Filter
    3) IG (in ground)
    4) Pebble
    5) 20 flow rate
    6) Believe pool was built in 2003
    7) Salt Water Pool

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    linen's Avatar
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    Re: Newbie-Is my chlorine level safe to swim

    So the previous 4 lbs should have raised you to ~24 ppm (using "effects of adding chemicals" section on poolcalculator.com and 20000 gallons), assuming you were close to zero before. How recent was the last 4 lbs (assuming that is in addtion to the first 4 lbs)?
    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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    Re: Newbie-Is my chlorine level safe to swim

    Before the first addition of CYA I was at zero. I just did a CYA test and I'm sitting at 45 ppm. Take in mind I just added the chemicals on Thursday night and ran the pool 24 hours straight. In reading the forums it is recommended to wait 3 - 7 days before testing. So I'm not sure how accurate the 45 ppm is.
    1) 20,000 gallons
    2) Pentair DE Filter
    3) IG (in ground)
    4) Pebble
    5) 20 flow rate
    6) Believe pool was built in 2003
    7) Salt Water Pool

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    linen's Avatar
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    Re: Newbie-Is my chlorine level safe to swim

    So for 45 ppm cya (what are you using to test?), your shock level is 16 ppm per poolcalculator.com. It also sounds like your totalo of 8 lbs has almost all shown up (should be about 48 ppm). I am using poolcalculator.com to get these numbers.

    By the way, how does your water look?
    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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    Re: Newbie-Is my chlorine level safe to swim

    The water is clear. No signs of any algae. I'm using the TF-100 test kit the chemicals it mentions to use and the "C.A. View Tube" that is included with the kit. When you are saying that my shock level is 16ppm, What does that mean?? Does that dictate how much chlorine is safe to swim?
    1) 20,000 gallons
    2) Pentair DE Filter
    3) IG (in ground)
    4) Pebble
    5) 20 flow rate
    6) Believe pool was built in 2003
    7) Salt Water Pool

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    elwood58's Avatar
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    Re: Newbie-Is my chlorine level safe to swim

    Quote Originally Posted by jonavarro26
    The water is clear. No signs of any algae. I'm using the TF-100 test kit the chemicals it mentions to use and the "C.A. View Tube" that is included with the kit. When you are saying that my shock level is 16ppm, What does that mean?? Does that dictate how much chlorine is safe to swim?
    Completely clear water up to shock level of 16 is safe to swim. Let your FC drift down a bit and you should be good to go. Definitely want to get the kids to stop peeing in the pool.
    19204 Gallon L Shape with a 10X10 2nd Step Baja Ledge. Intellichlor IC-40, IntellipH, Cartridge Filter, Pentair Heater/Chiller (Heat Pump). Tons of Deck with Deck Jets. Construction Complete 6/5/17.

    "If you don't measure it, you can't manage it!"

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    Re: Newbie-Is my chlorine level safe to swim

    Thanks Elwood
    1) 20,000 gallons
    2) Pentair DE Filter
    3) IG (in ground)
    4) Pebble
    5) 20 flow rate
    6) Believe pool was built in 2003
    7) Salt Water Pool

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