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Thread: First time shocking pool going bad

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    First time shocking pool going bad

    So I wanted to shock the pool due to a green haze floating in the pool water. After a few days of research I started my shock last night. So mistake number one I went with the pool store guy about how much liquid chlorine to add to the pool which he said 3 cases (12 gal) plus an algae killer that has copper in it. I come home this morning after work and tested the fc to which I'm at 37.5. Is this a level I should be concerned with? I stupidly left the swg on also to help get the fc level up to which I now have off. The pool still has a green haze to it and when I checked my cya I am now at less than 30. Before the shock I was at 60 so I'm assuming the high levels is throwing off the cya as it cant lower itself without taking water out? Anyway I have the pool cover off to have the sun help burn off some chlorine and the pump is still running. Brushed the pool again to help kick up everything. Also I use the Taylor 2006 test kit.
    After Shock:
    FC: 37.5
    CC: Didn't bother with
    PH: Too high for reading (not accurate anyway) but did an acid test just to play around and it took 5 drops to get it at 7.5
    Alkalinity: 80
    Hardness: 400
    CYA: less than 30

    Before the shock:
    FC: .2
    CC: .5
    AL: 80
    PH: 7.5
    CH: 400
    CYA: 60
    20x40 36000gal in-ground vinyl pool
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    hayward swg
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    Mod Squad tim5055's Avatar
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    Re: First time shocking pool going bad

    Welcome to TFP!!

    37.5 is just slightly above mustard algae shock level, so I'm not overly concerned about that, so lets move on....

    We do not "shock" our pools, we follow the SLAM Process when there is a problem. Read through that and as long as you have an accurate test kit you can move forward with the SLAM.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    mrcarcrazy's Avatar
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    Re: First time shocking pool going bad

    WHOA. I hope you turned the SWG off?

    Anywho, there's not much you can do now, basically just a waiting game. I would still assume your CYA is 60 unless you partially drained and refilled.

    Pool math on this site is a great tool. I'd suggest you use that instead of the pool store experts.

    Now that you've hit it with so much chlorine, just keep it @ the slam level for CYA of 60 until you pass the three criteria to stop. Then let it fall down to target, and restart the SWG. retest CYA once chlorine levels are in a more appropriate place. You will likely want to raise it a little due to using a SWG (increase the lifespan of that expensive little bugger).
    IG gunite/plaster pool/spa Started 1/17/14, Plastered 5/16/14
    Size: 12'-21'x39' free form, depth ranging from 4' to 7, attached 6 person spa with spillover.
    Equipment: Whisperflo 2hp pump, Pentair 30" sand filter, Pentair Mastertemp 400k BTU heater, 1hp Whisperflo for waterfalls, and a blower for spa floor

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    Richard320's Avatar
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    Re: First time shocking pool going bad

    Welcome!

    Obviously that pool guy advocates the nuclear option to pool clearing. Avoid him.

    Whatever damage to the liner has been done, so you're doing the right thing now. SWG off, pool uncovered, and Pool Owner Patience.
    pop.gif

    When FC gets down to 10 or less, recheck pH and CYA and then resume the SLAM the right way. You've got a good test kit, so you'll be able to handle it. In the meantime, take advantage of that high FC and brush brush brush. You know any algae you expose will be killed in a hurry.

    I'll bet if you took a sample to that same pool store guy right now, he'd sell you Chlorine reducer!
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: First time shocking pool going bad

    Ok good thanks for the fast replies guy appreciate it! I can now go to bed worry free . Also quick question about my sand filter that you might know. After a backwash I'm usually at 10 psi and it wont move much past that for a good month or two. Is that normal to only have to back wash once or twice a season? (I live in Wisconsin, the season is short) And I did read the SLAM way before hand which is what my target was for fc to be at (24) but missed it by a few lol.
    20x40 36000gal in-ground vinyl pool
    sand filter
    hayward swg
    heater
    pump

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    Mod Squad tim5055's Avatar
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    Re: First time shocking pool going bad

    Quote Originally Posted by Mingman82 View Post
    Ok good thanks for the fast replies guy appreciate it! I can now go to bed worry free . Also quick question about my sand filter that you might know. After a backwash I'm usually at 10 psi and it wont move much past that for a good month or two. Is that normal to only have to back wash once or twice a season? (I live in Wisconsin, the season is short) And I did read the SLAM way before hand which is what my target was for fc to be at (24) but missed it by a few lol.
    Some folks only backwash once a season.

    Remember, the SLAM is an ongoing process, not a one time event. You test and adjust back to your shock level multiple times a day for as long as it takes. The key in SLAM is the "M", for Maintain.

    Brush at least once a day to break up any algae that may have a biofilm protecting it from the chlorine.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Richard320's Avatar
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    Re: First time shocking pool going bad

    Quote Originally Posted by Mingman82 View Post
    Ok good thanks for the fast replies guy appreciate it! I can now go to bed worry free . Also quick question about my sand filter that you might know. After a backwash I'm usually at 10 psi and it wont move much past that for a good month or two. Is that normal to only have to back wash once or twice a season? (I live in Wisconsin, the season is short) And I did read the SLAM way before hand which is what my target was for fc to be at (24) but missed it by a few lol.
    Yes, once or twice a year is normal. It just depends on how much stuff blows into the pool and how much gets tracked in by dirty children. Just watch the gauge and the return flow. If all is well, all is well.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: First time shocking pool going bad

    Well woke up about an hour ago new results.
    FC: 16.5
    CYA: still less than 30

    Although pool is now a blue instead of green and I turned the swg back on.
    20x40 36000gal in-ground vinyl pool
    sand filter
    hayward swg
    heater
    pump

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    Mod Squad tim5055's Avatar
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    Re: First time shocking pool going bad

    Quote Originally Posted by Mingman82 View Post
    Well woke up about an hour ago new results.
    FC: 16.5
    CYA: still less than 30

    Although pool is now a blue instead of green and I turned the swg back on.
    If you are in the middle of a SLAM leave the SWG off and chlorinate with liquid.

    Read the directions on SLAMing your pool in the How To section of Pool School and follow that procedure completely to the end.



    • CC is 0.5 or lower;
    • You pass an OCLT (ie overnight FC loss test shows a loss of 1.0 ppm or less);
    • The water is clear.


    When all three are true, you are done SLAMing and can allow the FC to drift down to normal levels.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: First time shocking pool going bad

    Update. Pool looks pretty good now thanks for the help. As for the chem part of it.
    FC: 7.5
    PH: 7
    TA: 85
    CA: too much metals to know for sure but guessing around 400 (well water)
    CYA: still less than 30.
    Guess I didn't do the cya test right before the slam. It's a new bottle of cyanuric acid. When I go to the store later today I'll have them test it too before I buy stabilizer. Also the pool was just put in last year if that matters.
    20x40 36000gal in-ground vinyl pool
    sand filter
    hayward swg
    heater
    pump

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    Texas Splash's Avatar
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    Re: First time shocking pool going bad

    Just a couple concerns from your latest post:
    - Are you still SLAMming? If so, your FC should be 12. If you have pass all 3 SLAM requirements as noted above, then you certainly can let it drop.
    - PH seems low, but again if you are in the middle of a SLAM it won't read properly anyways.
    - There's no CC reading this morning. It would be good to see that one
    - CYA less than 30 means lots of FC lost to the sun. You probably know our feelings about going to the pool store for help on tests.

    If I missed anything in your post or you need anything else, please let us know. Have a good day.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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    Re: First time shocking pool going bad

    Sorry didn't think about CC as their was none/ 0. Different pool store. Done with slam met all three criterias. Stapped slamming Friday morning. Still letting the fc come down on its own. I did turn the swg on this morning though only because it's been raining for the last 3 days and another 2-3 in of rain today ( why I think there is a low ph also. )

    Edit. I've been slamming at a fc of 24 so that's where it's coming down from.
    20x40 36000gal in-ground vinyl pool
    sand filter
    hayward swg
    heater
    pump

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    Mod Squad tim5055's Avatar
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    Re: First time shocking pool going bad

    Quote Originally Posted by Mingman82 View Post
    Sorry didn't think about CC as their was none/ 0. Different pool store. Done with slam met all three criterias. Stapped slamming Friday morning. Still letting the fc come down on its own. I did turn the swg on this morning though only because it's been raining for the last 3 days and another 2-3 in of rain today ( why I think there is a low ph also. )

    Edit. I've been slamming at a fc of 24 so that's where it's coming down from.
    Do you not have your own test kit???
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: First time shocking pool going bad

    Yes the Taylor 2006.
    20x40 36000gal in-ground vinyl pool
    sand filter
    hayward swg
    heater
    pump

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    Mod Squad tim5055's Avatar
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    Re: First time shocking pool going bad

    Why do you keep talking about pool store testing?
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: First time shocking pool going bad

    Instead of the pool store you can also head to Home Depot, Lowes, Walmart ... for stabilizer. You said you had a new bottle and it made me think maybe the pool store is selling you the $$$ liquid.
    Liquid stabilizer is handy because you can add it and turn around and test but the granular is so much cheaper.
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