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Thread: Question about shock--0.25 chloramines

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    Question about shock--0.25 chloramines

    Hi,
    I've been mostly following these great techniques and this website for 1 year. I haven't shocked my pool since following the methods, and i'm getting a bit nervous. Last year, perhaps every other chlorine test, there was a flash of red using the dpd taylor test kit (the test for chloramines i believe). This year, there is consistently a tiny bit of red when i add the three drops, that always clears with one drop of titrant. When would i want to shock? Thanks. Steve
    16,000 gallon, inground. Diamond bright finish. Hayward 1.5 hp superpump, quad 80 DE filter, Jandy legacy gas heater

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    Mod Squad jblizzle's Avatar
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    Re: Question about shock--0.25 chloramines

    That sounds like you would be in the 0.5ppm for CC range , which is not necessarily bad. Although you are noting that this is different than previous ... which is great and shows you are watching your pool.

    To check if you need to shock the pool, you can always do an OCLT which would show if something is hiding in the pool.
    Jason, TFP Moderator
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    JasonLion's Avatar
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    Re: Question about shock--0.25 chloramines

    CC levels up to one drop of titrant are fine, just ignore them.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    bobodaclown's Avatar
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    Re: Question about shock--0.25 chloramines

    Are you doing the 10ml or 25ml measurement? The 10ml measurement, .5ppm accuracy rate is exact enough for pool care. You'll save on regents.
    Hope that info helps.
    Bob
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, Hayward Astrolight SP0581N, SWCG CalimarTitanium Edition TE45 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

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    Re: Question about shock--0.25 chloramines

    Thank you for the help. I was/ am using the 10ml measurement, and mistyped above, and use 5 drops of the reagent to detect chloramines.
    Can I ask when i should shock? Chloramines at 1.0? 1.5?

    Thanks Steve
    16,000 gallon, inground. Diamond bright finish. Hayward 1.5 hp superpump, quad 80 DE filter, Jandy legacy gas heater

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    Richard320's Avatar
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    Re: Question about shock--0.25 chloramines

    Quote Originally Posted by central nj
    Thank you for the help. I was/ am using the 10ml measurement, and mistyped above, and use 5 drops of the reagent to detect chloramines.
    Can I ask when i should shock? Chloramines at 1.0? 1.5?

    Thanks Steve
    The general rule of thumb is over 1.

    That being said, it depends. A lot of municipal water systems use chloramines. So if you just added a bunch of water, they'll read high for a day or so until the sun takes care of it. I've gone weeks - no, months - with either zero or .5 CC. Then all the sudden, 1.5! Guess what, the day before my wife had some friends over, so there was quite a bather load. I added an extra quart of chlorine when I dosed it, and CC was back to normal the next day.

    Relax and enjoy.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Mod Squad jblizzle's Avatar
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    Re: Question about shock--0.25 chloramines

    I have to ask. How do you define "shock"?

    You should follow the shock process if:
    -CC of 1ppm or higher (sometimes ... see Richard's post)
    -visible algae / cloudy water
    -Failing OCLT if you think your FC demand is high

    You can always bump up the FC a bit before and/or after high usage to help clear the pool, but there is no need to "shock" a pool a given time intervals.

    If you maintain your FC correctly, you may never have to go through the shock process.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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