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Thread: Shocking SWG Pool???

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    Shocking SWG Pool???

    New to the board. Wealth of information here that the pool store will hate that I now know. I've always taken a water sample to the pool store and walked out at least $100 lighter in the pocket. It's always seemed like a moving target up until now. I've learned more about pool chemistry and how to adjust it in the two days I've been on this site than the entire 5 years I've owned a pool.

    Just converted to salt this year. I've adjusted the chemical levels as follows:

    Salt = 3300ppm
    FC = 5
    CC = 0.2
    TA = 70
    pH = 7.3
    CYA = 70

    According to the chlorine/cya chart the shock level for this pool would be around 28ppm. My question is - when raising the FC to this high of a level, how long will it take to come back down to a swimmable level? Should I turn off the SWG until it drops back to 5ppm?

    In the past, I've always used either a 15min shock or non-chlorinated shock. How does a non-chlorinated shock even work? Do I even need to worry about shocking as long as the CC stays below 0.5?
    In-ground, vinyl pool, 26,000 gals
    Hayward Sand Filter, Aquarite SWG, Hayward Ecostar Pump

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    Re: Shocking SWG Pool???

    when raising the FC to this high of a level, how long will it take to come back down to a swimmable level?
    As are many answers on this forum, " it depends". A typical pool loses 2-3ppm daily of FC. Higher FC levels lose a little quicker so I would SPECULATE that it will take 3-4 days for your pool to return to correct levels if your current CYA is 28ppm. Pure speculation but I am probably pretty close. Incidentally, it is safe to swim in your pool at any level of FC up to and including shock level.

    Naturally, shutting of the SWG allows your FC to come down more quickly.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: Shocking SWG Pool???

    In the past I've always been advised to "shock" the pool every week, after high swim loads, after storms - this usually involved adding 3#s of Shimmer n Shock or a non-chlorinated shock. Pool is 26000 gals.

    Do I even need to worry about shocking as long as the FC stays around 4-5 and the CC stays below 0.5ppm?
    In-ground, vinyl pool, 26,000 gals
    Hayward Sand Filter, Aquarite SWG, Hayward Ecostar Pump

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    Mod Squad jblizzle's Avatar
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    Re: Shocking SWG Pool???

    What you were previously doing was not the shock process as recommended here and described in Pool School. If your water is clear and CC < 0.5ppm and your SWG is maintaining FC without adjustment, then you should not need to shock. You need to go through the shock process if you seeing something is "off" ... for example, if FC drops, algae appears, CCs show up, etc.
    Jason, TFP Moderator
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    Re: Shocking SWG Pool???

    If in doubt, I would try an overnight FC Loss test as described here:
    http://www.troublefreepool.com/pool-...rnight_fc_test

    Your current FC of 5 is fine so if it holds overnight (with the SWG off), you're good. I have had algae in my pool but the constant flow of Cl from the SWG masked/prevented a full bloom, causing the SWG to need to work harder to keep up.

    If the overnight drop test fails, you should shock per the instructions in pool school. "Shock" isn't a product, its a process.
    24000 gal vinyl IG; CPSC36 SWG, TA-60 Sand Filter

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    Re: Shocking SWG Pool???

    Quote Originally Posted by duraleigh
    Incidentally, it is safe to swim in your pool at any level of FC up to and including shock level.
    Not that I doubt you or anything but, why do all of the test strips, pool stores, etc usually advise to wait until it's in the 3.5-3.8ppm range to swim?
    In-ground, vinyl pool, 26,000 gals
    Hayward Sand Filter, Aquarite SWG, Hayward Ecostar Pump

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    Butterfly's Avatar
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    Re: Shocking SWG Pool???

    Quote Originally Posted by Bent6
    Quote Originally Posted by duraleigh
    Incidentally, it is safe to swim in your pool at any level of FC up to and including shock level.
    Not that I doubt you or anything but, why do all of the test strips, pool stores, etc usually advise to wait until it's in the 3.5-3.8ppm range to swim?
    well, it is because they do not understand the relationship between chlorine and cya.

    welcome to the forum
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    Re: Shocking SWG Pool???

    I haven't had to shock my pool in six years. If you keep the levels balanced you may never have to shock it. If you have no CC, the water is clear, no algae or organic materials, there is no reason to shock. When you do need to add CL for any reason including shocking, liquid chlorine is always best.
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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    Re: Shocking SWG Pool???

    Quote Originally Posted by Bent6

    According to the chlorine/cya chart the shock level for this pool would be around 28ppm. My question is - when raising the FC to this high of a level, how long will it take to come back down to a swimmable level? Should I turn off the SWG until it drops back to 5ppm?

    In the past, I've always used either a 15min shock or non-chlorinated shock. How does a non-chlorinated shock even work? Do I even need to worry about shocking as long as the CC stays below 0.5?
    I like the chart on this page: http://www.poolsolutions.com/gd/best-gu ... chart.html

    I think it's a pretty good guide.
    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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