To SLAM or NOT

[rmturner54]

I started noticing a brown/green layer in the pool in a few areas such as ledges and a few areas on the wall. The water appeared to be clear. Once it was brushed and vacuumed obviously the water would get cloudy. This started 3 or 4 days ago. I have replaced the cartridge filter with my clean backup. Vacuuming as ofetn as possible.
Test results as follows:

5/14, 3PM
FC 5, CC 0.5
PH 7.8, I know this is a little high been adding baking soda to get TA up to 80
TA 80
Salt 3300
Wtr temp 81

5/15, 10AM, just prior to pump starting
FC 4, CC 0.5
nothing changed
Shut off SWG
I added 116oz of bleach just for precautions.
FC 10, CC 0.5 at 12N
FC 6 at 630PM, pump is off normal.

Gonna wait till sun is off of pool and test FC to start the OCLT

 

[Texas Splash]

At this point, there's really no need to do the OCLT. Brushing, vacuuming, and a short-lived FC increase will not work. You need to perform the SLAM thoroughly as noted on the SLAM page (link below). That's the only way to kill the algae. You need to first lower pH to about 7.2 then increase and maintain the proper SLAM FC level based on your current CYA (what is your CYA?). Only after doing that should you then consider the OCLT as the final item to test when looking to pass the 3 SLAM criteria. Let us know if you have any questions.

- - - Updated - - -

For your FC (Bleach), regular HEB (Bravo) or Wal-Mart (Great Value) will work just fine. The regular/plain stuff.

 

[rmturner54]

60 to 70

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[Texas Splash]

Best to round-up when not sure. So a CYA of 70 requires an FC SLAM level of 28. You can leave the SWG off or at a low percentage if you wish during the SLAM. Some people find it easier to calculate bleach additions with it off. It's up to you. Good luck, and let us know you have any more questions.

 

[rmturner54]

Thanks. Thats what i thought

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[Texas Splash]

You're very welcome. If you're caught in tonight's weather, be safe. We'll watch for your updates later.

 

[rmturner54]

I work all day and dont have anyone to monitor. So should i just dose to slam level or more

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[Texas Splash]

No problem. I wouldn't go more than maybe 2-3 ppm over your SLAM. Anything too high just becomes a waste of your bleach (to the sun) and doesn't really help the SLAM go any faster. You can just increase it when you get home.

 

[rmturner54]

Ok

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[Texas Splash]

Actually, that may be one of those times where your SWG can come-in handy during your absence. To help slow-down FC loss.

 

[rmturner54]

Good point. I will leave it on at say 50%. Which is about where i run it

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[rmturner54]

Got home from work at 530. Tested FC at 16.5 and PH 7.6. Vacuumed pool.
Now i have a benchmark. Added enough bleach to bring back to SLAM level of 28. Add MA to bring PH to 7.2 Now waiting to test FC again. Once i test FC again i will thwn shut off swg and test again in tje morning before i go to work.
Leaving the pump on all the time during the slam...of course

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[Texas Splash]

Good work on the FC! Now remember .... the pH gives you a "false high" because the FC is over 10. So don't bother lowering the pH or testing it when you know the FC is over 10 during a SLAM.

 

[rmturner54]

Oh yea...i knew that. Just forgot. This why i love this forum

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[rmturner54]

Tested FC again at 815PM
Over shot target a little.
FC 31. Pump running and swg off.....will test in the morning before i go to work i will test again.

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[Texas Splash]

Good luck!

 

[rmturner54]

Tested FC this morning before going to work at 6AM.
FC was 28. Turned swg back on and off to work.


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[pooldv]

Good plan! Go make some bleach money.

 

[rmturner54]

LOL...i feel like iam almost there

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[rmturner54]

Got home late from work last nite. Tested at 9pm. Fc 18. Brought fc up to 29 to 29.5 at 10pm. Swg is off. Tested at 5 am before work. Fc 29.5
Is 7 hours without a change in fc good enough

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