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Thread: How to measure chlorine levels of 15-20 ppm for shocking with bleach

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    How to measure chlorine levels of 15-20 ppm for shocking with bleach

    I have a healthy crop of green algae in my 18,000 gallon plaster pool. I want to use bleach to shock. I've measured the CYA at 50, which according to the TFP table requires a chlorine level of 20 ppm. My Taylor test kit only reads levels up 5 ppm. How do you measure higher levels of chlorine?

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    Mod Squad jblizzle's Avatar
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    Re: How to measure chlorine levels of 15-20 ppm for shocking with bleach

    Welcome to TFP!!!

    You need to have one of the Recommended Test Kits that includes the very critical FAS-DPD Chlorine Test.

    Please add your pool details to your signature as described HERE as it will help us help you.
    Jason, TFP Moderator
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    Re: How to measure chlorine levels of 15-20 ppm for shocking with bleach

    You could calculate a dose of to reach the minimum shock level of 20ppm pretty easily with the pool math application. It won't stay at 20 long though with a growing crop of algae. The test kits are helpful, but at the start of your SLAM you will be chasing to keep chlorine above minimum SLAM level. Do you have any other issues? Leaves, dirt, etc?
    26000 gallon Kidney shaped gunite pool. Older pool with deep dive well, nice diving board and tall slide. 31" Hayward pro sand filter with Pentair 1.5hp pump. Testing with the TF-100 plus test kit. Using a Dolphin Nautilus pool cleaner robot, next to bleach, my pools best friend.

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    BoDarville's Avatar
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    Re: How to measure chlorine levels of 15-20 ppm for shocking with bleach

    The FAS-DPD Chlorine Test is required for the SLAM - no way around it.

    You can help speed up the SLAM process by manually removing any debris (leaves, branches, dirt, etc.) from the pool.
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
    A good test kit is an investment, not an expense.

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    PoolESQ's Avatar
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    Re: How to measure chlorine levels of 15-20 ppm for shocking with bleach

    The test kit is a must. It is easy to use and reads higher levels and more accurately than many other types of tests.
    Replastered 2015: Sunstone Quartz Midnight Blue 16x32 rectangular gunite with in-pool spa....18,000 gallons. Autopilot Total Control System with SWG and acid pump. Pentair Clean & Clear 420. Auto cover. TF-100.

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    Isaac-1's Avatar
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    Re: How to measure chlorine levels of 15-20 ppm for shocking with bleach

    Trying to perform the SLAM procedure without the FAS-DPD chlorine test is a bit like driving a car blindfolded, you may get where you are going, but there are likely to be a few bumps along the way and some unexplained dings when you get there.
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
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    Beens's Avatar
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    Re: How to measure chlorine levels of 15-20 ppm for shocking with bleach

    You can buy the fas/dpd test as a separate component rather than a whole new kit depending on which Taylor kit you have. You may have the kit that has everything but the right chlorine test.

    TFTestkits.net

    Which Taylor kit do you have?
    18' x 48" (42" water depth) Intex Metal Frame 6,700 Gallons
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    Hayward Pro Series S166T Sand Filter
    Original Intex Floating Skimmer

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    Divin Dave's Avatar
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    Re: How to measure chlorine levels of 15-20 ppm for shocking with bleach

    If you have the Taylor K2005, then you are good with getting only the FAS-DPD,

    if however you only have the Taylor K1000 which only measures FC to 5 and pH, and depending on the pool store to measure your CYA, then it would be best to replace the test kit you have, so that you can measure CYA, as well as all other water parmeters yourself.
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

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