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Thread: slamming - added recommended bleach, got low FC increase

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    slamming - added recommended bleach, got low FC increase

    OK I just opened my pool to a green swap and so reading the pool school and attempting to slam it.

    I punched these numbers into pool math:

    24300 gallons
    0 FC -> 29 FC
    ph 7.0
    Ta 70
    Ch 150
    CYA 75

    It recommended a shock level of 29 and to get to that from 0, 1063 oz of 8.25 bleach. I added, tested after half hour with pump running and got 12 FC. Waited another half hour thinking maybe it just hadnt mixed all the way, got 11.5. Both times I got 1 CC.

    I added the bleach by pouring over the deep end returns and am using the TF-100 test kit.

    Any thoughts on what I should do? Did I add too much at once? Could my bleach (all new bottles of Crystal brand) be bad?

    Thank you in advance for any suggestions.
    24,300 gallons, IG vinyl, Hayward Pro Series S244T sand filter, 3ft to 9ft deep

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    Mod Squad JohnT's Avatar
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    Re: slamming - added recommended bleach, got low FC increase

    Odds are, with a green pool the algae is consuming the chlorine almost as fast as you add it.

    Add what it takes to get to shock level, then test and add more an hour later as needed. Repeat until there is little drop in the hour between tests, then go to four hour intervals.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
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    Divin Dave's Avatar
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    Re: slamming - added recommended bleach, got low FC increase

    Yup. what JohnT said. Keep maintaining the FC and backwash when you need to.
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

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    Richard320's Avatar
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    Re: slamming - added recommended bleach, got low FC increase

    Don't forget to brush to expose the algae on the walls and get the bleach mixed up good.
    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: slamming - added recommended bleach, got low FC increase

    Ok, thanks. I will keep after it.

    I was rereading the testing instructions and just realized I wasn't doing the CC test correctly, so that 1 CC number was completely wrong.
    24,300 gallons, IG vinyl, Hayward Pro Series S244T sand filter, 3ft to 9ft deep

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    Re: slamming - added recommended bleach, got low FC increase

    Just did my last test for tonight. Had given one last brushing a little earlier.

    FC: 30.5
    CC: still 1 after doing the test the right way

    So, a few things are confusing to me. I added that chlorine up to shock level a couple hours ago and since then i show almost no loss, does that seem too soon? Also shouldn't the CC be much higher if its killing bacteria and algae? Just wondering how I could have gotten these results which to me look like little activity; would it be worth double checking my CYA?

    Plus as I'm typing i can hear it starting to rain outside; how does rain normally affect the slamming process and test results?

    Thanks again for your help.
    24,300 gallons, IG vinyl, Hayward Pro Series S244T sand filter, 3ft to 9ft deep

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    Re: slamming - added recommended bleach, got low FC increase

    Just want to throw out there that you could consider using a 5ml water sample where each drop = 1 instead of .5. Doing 60 drops has got to be a drain.
    12500 gallons, 24 foot round above ground
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    Re: slamming - added recommended bleach, got low FC increase

    Rain has little affect on Pool Water Chemistry. Many don't believe that but it is generally a true statement.

    Diluting your accuracy to 1.0 ppm with the 5 ml sample is okay but the more newbies "trick up" these tests, the more confused they usually get.

    The biggest issue with Chewbiscuit's pool is the CYA of 75 which calls for the FC to be so high. A drain/refill to get CYA down to 40 would lower his SLAM value to 16 ppm and save FC the rest of the swim season.
    Dave S.
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    Re: slamming - added recommended bleach, got low FC increase

    Quote Originally Posted by duraleigh View Post
    Rain has little affect on Pool Water Chemistry. Many don't believe that but it is generally a true statement.

    Diluting your accuracy to 1.0 ppm with the 5 ml sample is okay but the more newbies "trick up" these tests, the more confused they usually get.

    The biggest issue with Chewbiscuit's pool is the CYA of 75 which calls for the FC to be so high. A drain/refill to get CYA down to 40 would lower his SLAM value to 16 ppm and save FC the rest of the swim season.
    I looked some draining posts. So do I just run the hose and keep back washing to replace water? Is there a time interval where I can stop and recheck my CYA? (1 hrs, 4 hrs)
    24,300 gallons, IG vinyl, Hayward Pro Series S244T sand filter, 3ft to 9ft deep

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    Richard320's Avatar
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    Re: slamming - added recommended bleach, got low FC increase

    Quote Originally Posted by ChewBiscuit View Post
    I looked some draining posts. So do I just run the hose and keep back washing to replace water? Is there a time interval where I can stop and recheck my CYA? (1 hrs, 4 hrs)
    Use the "waste" setting on your multiport valve to drain. It bypasses the sand completely. Pool > pump> waste line.

    When I drain and refill to lower CH, I just check it a day later after it's had plenty of time to mix. I know I'll lose the same percentage of CYA.
    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: slamming - added recommended bleach, got low FC increase

    Quote Originally Posted by Richard320 View Post
    When I drain and refill to lower CH, I just check it a day later after it's had plenty of time to mix. I know I'll lose the same percentage of CYA.
    Wow what a great idea. Seeing as the CYA test in the TF-100 uses quite a bit of R-0013, this is a great way to get a good estimate without wasting R-0013. I always have plenty of reagent for the calcium tests.
    Rick
    Installed June 2012 Aqua Leader 24ft Round AG Influence w/54 inch walls 13,500 gallons
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    Re: slamming - added recommended bleach, got low FC increase

    I just vacuumed a little bit ago and I have a bad feeling I have a ton of **** in the bottom of my deep end. But I can't see it to aim my net/ brush/vacuum at it. When I was vacuuming it, a bunch of **** kicked up like leaves and dead earth worms. Then the water got super cloudy and my returns were blasting dirty water for a few seconds back in.

    I'm concerned about not being able to see what's down there and that its hampering my efforts. What do i do?

    On the plus my water is now blue with a slight green tint over the deep end instead of bright green after one day slamming. Im just worried the crud down below is going to prevent me from getting it done all the way.
    24,300 gallons, IG vinyl, Hayward Pro Series S244T sand filter, 3ft to 9ft deep

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    Mod Squad JVTrain's Avatar
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    Re: slamming - added recommended bleach, got low FC increase

    Gotta get that sludge out of there. It's only going to eat up your $$$ on bleach. Sweat equity time. Get in there with a leaf rake and get you as much as you can, even if it's blindly. Rake til you can't rake no more (either due to being tired or no more stuff, preferably the latter). Then vacuum, with a leaf bag is preferred if you have one.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
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