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Thread: Should I shock?

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    Should I shock?

    I was on vacation for the past week or so and when I got back I noticed from green algae on my light and fixture. I put pucks in while I was gone and tested my FC about 2.0 when I got home. Probably a little low for my CYA of 45.

    I brushed off the algae.. I tested with my kit and got 3.5 FC, 0 CC.. (I added some chlorine) Should I still shock because I saw algae?
    ~13000 inground plaster
    150sq Ft Cartridge Filter

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    Mod Squad Bama Rambler's Avatar
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    Re: Should I shock?

    Probably so, but do an overnite chlorine drop test to be sure. Here's how to do it. Pool School Overnite FC Test

    You'll need a FAS-DPD test to do it. Hopefully you have one of the recommended kits.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    frustratedpoolmom's Avatar
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    Re: Should I shock?

    I agree, an overnight test to be sure

    make sure you are brushing those areas where you saw visible algae for the next several days, and it's a good idea to up your FC level a few ppm's and run the pump more often, you may be getting FC "dead spots".
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
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    Butterfly's Avatar
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    Re: Should I shock?

    You have gotten good advice

    I, on the other hand, would shock my pool and not think twice about it

    Then, I'd do the Overnight Test.

    Sometimes I think it is easier to just shock it once, when you catch it early, rather than increase your FC level daily for a while. Your choice.

    Since we have been doing BBB, any shock we have done has been a one-time event.

    We rarely shock our pool. Maybe once or twice a year, and the twice would be "just because".
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
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    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

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  5. Back To Top    #5

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    Re: Should I shock?

    I brought my FC up to 15.5 last night, and it was 14 this morning. Still no CC though. I suspect the 1.5 drop was because I didn't test until 9am and there was some sun already hitting the pool. I'm guessing the overnight test has to be done early in the morning.
    ~13000 inground plaster
    150sq Ft Cartridge Filter

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    duraleigh's Avatar
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    Re: Should I shock?

    I, on the other hand, would shock my pool and not think twice about it
    While it's already been done (good work), I want to emphasize how much I agree with Butterfly......if you have visible algae in your pool, it needs to be shocked regardless of any test results.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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