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Thread: Marathon SLAM

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    Angry Marathon SLAM

    So I'm 11 days into my SLAM with no end in sight. Our pool stays open all year and is only 8 months old. Pool has always been clear, but we did hit zero FC during the winter due to some bad advice from our pool builder. We had always closed our pools before moving south to the new house, so I didn't question him at first. He claimed he treated it with PoolRX and I need not worry about CL level during the winter. After a few weeks thinking about this, I figured he was wrong and started to manually add CL...however I think it was all too late.

    Anyhow this all lead to an unsuccessful SLAM a few weeks ago where everything seemed to go good, but two days after our CC shot up to 6.

    So I went back into a full SLAM...11 days ago.

    Going into the slam our numbers looked like this:
    PH-7.4
    TA-70
    FC-3
    CC-3
    CYA-<30

    I've been keeping the FC level between 15 and 20 very consistently adding 10% bleach from Walmart (onsale for $2.50 a bottle) It has been eating between 3-5 gallons per day depending on the amount of sunlight we are getting.

    Two times I thought I was getting close where OCLT only dropped 2 at night with CC holding at zero only to have the CC come raging back into the 5-6 range several times. Today on day 11, I had the largest drop in FC going from 22 to 13 in 4 hours and the FC jumping up at the same time. The FC levels are swinging more the last few days rather than stabilizing.

    With everything that is going on I'm 99% certain this pool has/had an ammonia problem.

    So, what give here? Should I run a higher level of FC? I know with slamming it is to stay the course, but WOW, In 20 years of pool ownership I never experience anything like this.

    I'm open to any advice here!
    15K Gallon, IG Pebble Sheen pool with SPA (8/15/2015). Wrap around stone waterfall, spill over spa and bubbler on tanning shelf. Pentair FNS Plus 60 DE filter, Pentair Whisper Flo for filter circulation and Pentair Intelliflo for water features. Pressure side pentair sweeper, Pentair heater and Rainbow 320 Chlorinator (just use to keep CYA in check), Haas Liquidator and all powered by a Pentair Intellitouch system. K-2006 test kit.

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    Mod Squad jblizzle's Avatar
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    Re: Marathon SLAM

    This is a weird one. I have not heard of the CC fluctuation like that either

    No one is randomly dumping ammonia in the water are they?
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  3. Back To Top    #3
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    Re: Marathon SLAM

    Once thing for sure... we've had some erratic weather. I would first go back to SLAM basics:
    First, if you are REALLY worried about ammonia, do the 10-min drill:
    - Increase FC to 10; check FC every 10 minutes to ensure it doesn't drop below 5. If it does, increase FC right away back to 10 and keep checking every 10 min until it holds between 5-10, then continue with the SLAM as noted below.

    - Confirm that CYA. If it's below 30, add a little stabilizer to get ensure you are at 30. The sun is taking its toll. If you add stabilizer in 10 ppm increments, check about 24 hours later to see if that dot definitely goes away at 30.
    - Keep the FC at 12 as much as possible
    - The rest is on the SLAM page which I would review briefly each day as a reminder of things to do.

    Hopefully with the K-2006 you are testing FC with the 10ml samples (multiply # of drops by 0.5) to save on reagents. As with any SLAM, in the early part it's very critical to watch the FC closely so it stays at 12. When it goes to 3 like it was recently, you've lost a lot of fighting power.


    Hang in there.
    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
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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    Re: Marathon SLAM

    Quote Originally Posted by jblizzle View Post
    This is a weird one. I have not heard of the CC fluctuation like that either

    No one is randomly dumping ammonia in the water are they?
    Funny you say that, I sniffed a bottle of the WM Chlorine just to make sure it wasn't labeled wrong! LOL
    15K Gallon, IG Pebble Sheen pool with SPA (8/15/2015). Wrap around stone waterfall, spill over spa and bubbler on tanning shelf. Pentair FNS Plus 60 DE filter, Pentair Whisper Flo for filter circulation and Pentair Intelliflo for water features. Pressure side pentair sweeper, Pentair heater and Rainbow 320 Chlorinator (just use to keep CYA in check), Haas Liquidator and all powered by a Pentair Intellitouch system. K-2006 test kit.

  5. Back To Top    #5

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    Re: Marathon SLAM

    Quote Originally Posted by Texas Splash View Post
    Once thing for sure... we've had some erratic weather. I would first go back to SLAM basics:
    First, if you are REALLY worried about ammonia, do the 10-min drill:
    - Increase FC to 10; check FC every 10 minutes to ensure it doesn't drop below 5. If it does, increase FC right away back to 10 and keep checking every 10 min until it holds between 5-10, then continue with the SLAM as noted below.

    - Confirm that CYA. If it's below 30, add a little stabilizer to get ensure you are at 30. The sun is taking its toll. If you add stabilizer in 10 ppm increments, check about 24 hours later to see if that dot definitely goes away at 30.
    - Keep the FC at 12 as much as possible
    - The rest is on the SLAM page which I would review briefly each day as a reminder of things to do.

    Hopefully with the K-2006 you are testing FC with the 10ml samples (multiply # of drops by 0.5) to save on reagents. As with any SLAM, in the early part it's very critical to watch the FC closely so it stays at 12. When it goes to 3 like it was recently, you've lost a lot of fighting power.


    Hang in there.
    I've re-read that SLAM page every day hoping for a new clew to show up I'm on my third refill of the jumbo testing agents and just ordering another now as I am about 1/2 way through. My CYA tube only goes to 30 and I can barely see the DOT so I'm thinking it is closer to 25. I do have a bunch of pucks lying around that I can toss in the feeder to bring that CYA up.
    15K Gallon, IG Pebble Sheen pool with SPA (8/15/2015). Wrap around stone waterfall, spill over spa and bubbler on tanning shelf. Pentair FNS Plus 60 DE filter, Pentair Whisper Flo for filter circulation and Pentair Intelliflo for water features. Pressure side pentair sweeper, Pentair heater and Rainbow 320 Chlorinator (just use to keep CYA in check), Haas Liquidator and all powered by a Pentair Intellitouch system. K-2006 test kit.

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    Texas Splash's Avatar
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    Re: Marathon SLAM

    Using pucks right now won't really hurt you, but they may take too long (to dissolve) to help you with the SLAM. If you're still seeing the dot at 30, it may be quite low which is why I suggested the 10 ppm addition right away. I know that CYA test is a tricky one, but try to use the last of our daylight to get a good reading to ensure you have adequate protection for the chlorine (FC).
    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
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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  7. Back To Top    #7

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    Re: Marathon SLAM

    Just to clarify since starting the SLAM my FC has never dropped below 15 except for one time today where it hit 13. I'm testing between every two - 4 hours for 11 days straight.

    Oh and the speedstir paid for itself in the first three days of testing!!!
    Last edited by swreeder70; 05-12-2016 at 06:33 PM. Reason: typo
    15K Gallon, IG Pebble Sheen pool with SPA (8/15/2015). Wrap around stone waterfall, spill over spa and bubbler on tanning shelf. Pentair FNS Plus 60 DE filter, Pentair Whisper Flo for filter circulation and Pentair Intelliflo for water features. Pressure side pentair sweeper, Pentair heater and Rainbow 320 Chlorinator (just use to keep CYA in check), Haas Liquidator and all powered by a Pentair Intellitouch system. K-2006 test kit.

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    Re: Marathon SLAM

    I think you meant "FC" never dropped ... But yes, no doubt I could not imagine being without that speedstir. I once did OCLTs with an FC over 31. 72 drops gets old real fast. We'll watch your progress closely to see what other possibilities might be happening, or if there's anything else in the equipment we should consider.
    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
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

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    Re: Marathon SLAM

    Quote Originally Posted by Texas Splash View Post
    I think you meant "FC" never dropped ...
    But yes, no doubt I could not imagine being without that speedstir. I once did OCLTs with an FC over 31. 72 drops gets old real fast. We'll watch your progress closely to see what other possibilities might be happening, or if there's anything else in the equipment we should consider.
    Fixed it!
    15K Gallon, IG Pebble Sheen pool with SPA (8/15/2015). Wrap around stone waterfall, spill over spa and bubbler on tanning shelf. Pentair FNS Plus 60 DE filter, Pentair Whisper Flo for filter circulation and Pentair Intelliflo for water features. Pressure side pentair sweeper, Pentair heater and Rainbow 320 Chlorinator (just use to keep CYA in check), Haas Liquidator and all powered by a Pentair Intellitouch system. K-2006 test kit.

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    Re: Marathon SLAM

    Just ran my test number for the night:
    FC 18.5
    CC 1

    Will report back what I find in the AM
    15K Gallon, IG Pebble Sheen pool with SPA (8/15/2015). Wrap around stone waterfall, spill over spa and bubbler on tanning shelf. Pentair FNS Plus 60 DE filter, Pentair Whisper Flo for filter circulation and Pentair Intelliflo for water features. Pressure side pentair sweeper, Pentair heater and Rainbow 320 Chlorinator (just use to keep CYA in check), Haas Liquidator and all powered by a Pentair Intellitouch system. K-2006 test kit.

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    Re: Marathon SLAM

    6:00am numbers:
    FC 18
    CC .5

    Maybe the end is near!

    One thing worth noting is when I started this SLAM it was the first time I started using the on-sale 10% WalMart pool chlorine. Just wondering if it is weak or I got a bad batch? I did think it looked awfully pale in color and didn't smell very strong when I opened the bottles (all 50 of them!)

    Yesterday after starting back with the generic local 8.25% bleach my numbers were more stable during the day and overnight. Might be a coincidence. Anyone know how to decode the date codes on the WM bleach, I might have done that wrong.
    15K Gallon, IG Pebble Sheen pool with SPA (8/15/2015). Wrap around stone waterfall, spill over spa and bubbler on tanning shelf. Pentair FNS Plus 60 DE filter, Pentair Whisper Flo for filter circulation and Pentair Intelliflo for water features. Pressure side pentair sweeper, Pentair heater and Rainbow 320 Chlorinator (just use to keep CYA in check), Haas Liquidator and all powered by a Pentair Intellitouch system. K-2006 test kit.

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    Re: Marathon SLAM

    I too am starting to suspect the strength of the 10% Walmart chlorine. I think I am going to do some experiments on Sunday.
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
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    Re: Marathon SLAM

    Quote Originally Posted by swreeder70 View Post
    6:00am numbers:
    FC 18
    CC .5

    Maybe the end is near!

    One thing worth noting is when I started this SLAM it was the first time I started using the on-sale 10% WalMart pool chlorine. Just wondering if it is weak or I got a bad batch? I did think it looked awfully pale in color and didn't smell very strong when I opened the bottles (all 50 of them!)

    Yesterday after starting back with the generic local 8.25% bleach my numbers were more stable during the day and overnight. Might be a coincidence. Anyone know how to decode the date codes on the WM bleach, I might have done that wrong.
    What was the datecode on them?
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

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    Re: Marathon SLAM

    Quote Originally Posted by swreeder70 View Post

    Yesterday after starting back with the generic local 8.25% bleach my numbers were more stable during the day and overnight. Might be a coincidence. Anyone know how to decode the date codes on the WM bleach, I might have done that wrong.
    Could you post the date code or a picture of it?
    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
    Isolated Spa - 345 Gallons

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    Re: Marathon SLAM

    Pool Essentials Chlorinating Liquid out from KIK Pool Additives in Ontario Canada
    Labeled as 10% Sodium Hypo 90% other

    The stamp on the bottle is 16 071 19:45 B1 TX-01
    15K Gallon, IG Pebble Sheen pool with SPA (8/15/2015). Wrap around stone waterfall, spill over spa and bubbler on tanning shelf. Pentair FNS Plus 60 DE filter, Pentair Whisper Flo for filter circulation and Pentair Intelliflo for water features. Pressure side pentair sweeper, Pentair heater and Rainbow 320 Chlorinator (just use to keep CYA in check), Haas Liquidator and all powered by a Pentair Intellitouch system. K-2006 test kit.

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    Re: Marathon SLAM

    71 st day if 2016. Early March. From what I can tell.
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

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    Mod Squad JVTrain's Avatar
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    Re: Marathon SLAM

    The key part is 16 071. That means it was made on the 71st day of 2016: March 11, 2016. How it was stored between then and now would also make a big difference. Temperature mostly.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
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    Isolated Spa - 345 Gallons

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    Re: Marathon SLAM

    071 day is sometime in early March, so that bottle may be weakening.
    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
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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  19. Back To Top    #19

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    Re: Marathon SLAM

    Late to the party. Yes, bleach might be weakening. Only 2 months old, though, so that's not really that bad
    15,000 gallon free form Viking fiberglass pool. Hayward Star-Clear Plus C12002 cartridge filter. Hayward Swim Pure Plus T-15 SWG. Testing with TF-100 Kit. 2 speed 1.5HP Supreme pump. Dolphin Nautilus robotic cleaner

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    Re: Marathon SLAM

    Ok, that is how I interpreted it as well. It was in my garage on the concrete floor in 70-75 degree temps...and at the rate I burned through it I don't think storage was an issue on my end. At walmart it was on an endcap, where it was before then, who knows...but they got a pile of it in the store I was buying it from.
    15K Gallon, IG Pebble Sheen pool with SPA (8/15/2015). Wrap around stone waterfall, spill over spa and bubbler on tanning shelf. Pentair FNS Plus 60 DE filter, Pentair Whisper Flo for filter circulation and Pentair Intelliflo for water features. Pressure side pentair sweeper, Pentair heater and Rainbow 320 Chlorinator (just use to keep CYA in check), Haas Liquidator and all powered by a Pentair Intellitouch system. K-2006 test kit.

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