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Thread: Shocking before or after heavy use?

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    jefeyessica's Avatar
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    Shocking before or after heavy use?

    We are having a bunch of swimmers over later today. My FC is currently at around 2.0.

    I was thinking about putting the FC up to 5.0, so there will be enough chlorine for the heavy use. My question is, whether it's better to add the cholorine before the party, or after. Also, is 5.0 enough, or should I shock it up to 13?

    Thanks!
    14,200 gallon in ground Plaster Pool
    "Titan Vertical Grid Filter" -- Pressure DE, 60 sq ft filter area

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    sammm's Avatar
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    Re: Shocking before or after heavy use?

    I'd add after the fact. Too high of a chlorine level will be irritating to the swimmers.
    WetEdge Satin Matrix, 16K gallon, Pentair NSP-60 DE filter, Pac Fab Challenger, 2HP pump, BBB, Polaris 360

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    reebok's Avatar
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    Re: Shocking before or after heavy use?

    I would bring it up a couple ppm's beforehand. that's usually what I see the mods here recommend, and a little more chlorine (not shock level) will help ensure you don't get to 0. the bacteria everyone will be passing around could end up being more irritating, and a little raise in chlorine shouldn't be too noticeable.
    also, 2ppm is the absolute minimum according to the chlorine/cya chart (assuming an outdoor, non-swg pool with cya 20-30 pool). are you sure you're keeping your pool balanced? do you have a full set of test numbers and have you been indoctrinated with pool school? pool-school/
    16x32 21,000 gallon in-ground exposed aggregate, 1.5hp pump, 120 sqft catridge filter, birdcage, solar panels, aquavac tigershark qc robot.

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    jefeyessica's Avatar
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    Re: Shocking before or after heavy use?

    I am waiting for my TF100 kit to come in the mail. I am hoping it will arrive today or tomorrow. I currently have a cheap 4 way basic test kit, but with that one it's practically impossible to get an accurate read on the FC. I don't really know how much CYA I currently have, because we just refilled our pool. I added a gallon of conditioner (from Leslie's), so that should have brought up the level to about 25 CYA. After I get the test kit, and get accurate results, I want to get the CYA up to about 60ppm. (outdoor pool, in Texas, with direct sunlight all day).

    I just switched from pucks to BBB, and have read all the info from the pool school. I think I have the basics down, but really just need a good test kit first. Also, I still have some Trichlor shock left over from last year. If I want to get my CYA up, can I just use up that shock first? I would hate to have to buy more CYA, when I already have some of it in the form of shock and pucks. All of this is kind of frustrating right now, because I don't have good test numbers to work with. I want to be very careful not to get my CYA up too high, because that caused me to have to drain the pool (it was at 150 ppm).

    So for now, I'll bring my FC up to 5.0 before the party, then do another reading late tonight ,and add the needed Chlorine to get it back up to 5.0?

    Thanks for all your help!
    14,200 gallon in ground Plaster Pool
    "Titan Vertical Grid Filter" -- Pressure DE, 60 sq ft filter area

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    Re: Shocking before or after heavy use?

    Quote Originally Posted by jefeyessica
    I still have some Trichlor shock left over from last year. If I want to get my CYA up, can I just use up that shock first? I would hate to have to buy more CYA, when I already have some of it in the form of shock and pucks. All of this is kind of frustrating right now, because I don't have good test numbers to work with. I want to be very careful not to get my CYA up too high, because that caused me to have to drain the pool (it was at 150 ppm).
    I hear you loud and clear; I was there last winter.

    I assume the "trichlor shock" is granulated? I'd go ahead and use that up. Pucks, you can use them or you can save them for vacations. Occasional use won't make the CYA go up too fast. I also use my pucks if it seems the CYA needs a little nudge, because I'm a cheapskate and don't see why I should buy CYA when I have a lifetime supply of pucks in hand already.
    --paulr
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

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    JasonLion's Avatar
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    Re: Shocking before or after heavy use?

    Bring the FC level up a bit extra before the party. After the party, if the FC level fell to zero then shock, otherwise raise it up a bit extra for a day and you should be fine.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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