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Thread: Shocking With Granular CL in SWG Pool

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    Shocking With Granular CL in SWG Pool

    I have 2 large tubs of granular tri-chlor. Will I harm the SWG if I add the granular CL through the skimmer? Right now I need to raise my CYA and CH and I'd like to use up at least some of the granular tri-chlor that I have left whenever possible.

    FC = 3
    PH = 7.7
    CYA = 50
    CH = 50
    15x30 IG vinyl liner pool, pool cage
    Hayward S-220T high rate sand filter and Hayward super pump w/1hp motor
    Hayward SwimPure Plus SWG
    Polaris 380 cleaner and booster pump

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    frustratedpoolmom's Avatar
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    Re: Shocking With Granular CL in SWG Pool

    I recommend that you dissolve it in a bucket of water and then pour it in front of the return.
    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
    http://www.PerfectlyClearPoolService.com

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    Re: Shocking With Granular CL in SWG Pool

    Prior to installing the SWG, I always added the tri-chlor through the skimmer, so I'm not familiar with how quickly it will dissolve in a bucket. Is it fast dissolving?
    15x30 IG vinyl liner pool, pool cage
    Hayward S-220T high rate sand filter and Hayward super pump w/1hp motor
    Hayward SwimPure Plus SWG
    Polaris 380 cleaner and booster pump

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    Re: Shocking With Granular CL in SWG Pool

    I have never used the granulated trichlor but based on my experience with the pucks, I think hot water would dissolve it pretty well. Unless somebody knows it dissolves okay in a bucket of pool water.
    --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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    Re: Shocking With Granular CL in SWG Pool

    Just a quick point here: tri-chlor is tablet (or pellet) form and I think we're talking about Di-chlor here. The difference isn't large, but there is one

    Anywho, predissolve it and slowly pour in front of an active return. try not to let any of the undissolved gunk go into the pool - if there is some in the bottom of the bucket, stop pouring and add more water, mix and let it dissolve before adding it 8)
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

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    Re: Shocking With Granular CL in SWG Pool

    The label says tri-chlor. Its Aquachem from Lowes. I went ahead and tried to dissolve it in a bucket of pool water but it didn't dissolve well - lots left in the bottom of the bucket. So I just did my old normal routine and poured it through the skimmer with the SWG off. I'll keep the unit off until tomorrow.

    Sorry Waste, wish I would have seen your post prior to losing my POP!
    15x30 IG vinyl liner pool, pool cage
    Hayward S-220T high rate sand filter and Hayward super pump w/1hp motor
    Hayward SwimPure Plus SWG
    Polaris 380 cleaner and booster pump

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    JasonLion's Avatar
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    Re: Shocking With Granular CL in SWG Pool

    I have seen granular trichlor. Trichlor isn't great to use for shocking because it dissolves so slowly. Also, keep in mind that trichlor adds CYA and lowers the PH. Sometimes that is convenient but far more often it results in too much CYA and rapidly falling PH.
    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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    Re: Shocking With Granular CL in SWG Pool

    Quote Originally Posted by JasonLion
    Also, keep in mind that trichlor adds CYA and lowers the PH. Sometimes that is convenient but far more often it results in too much CYA and rapidly falling PH.
    Precisely for those reasons (+ CYA and - PH) is why I decided to use up some of the tri-chlor. My concern was adding it via the skimmer now that I have a SWG.
    15x30 IG vinyl liner pool, pool cage
    Hayward S-220T high rate sand filter and Hayward super pump w/1hp motor
    Hayward SwimPure Plus SWG
    Polaris 380 cleaner and booster pump

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    Re: Shocking With Granular CL in SWG Pool

    As long as the pump is on until the trichlor is all gone, putting it in the skimmer should be okay. You don't want it sitting in the skimmer with no water flow.
    --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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