With a CC of 2.0 you definitely have something consuming your FC. Test in morning and report back.
High CYA, first time LC user
- Thread starter bja1288
- Start date
I'd bring it up to slam again now why wait to the morning, obviously it's being consumed so why wait.
I’m up for it. Would require 3 more gallons of 12.5% to target 24 FC. As long as 7 gallons of 12.5% in a day isn’t a concern for a 22k vinyl pool
It's not a concern if it's getting consumed. Isn't that what your trying to accomplish to rid and destroy whatever is causing this besides the CC is backing up your actions.
First rodeo, just being cautious. I’m off to add my 3 gallons now. Will re-test chlorine in the morning. Thanks everyone!
- Jun 8, 2019
- 4,576
- Pool Size
- 20000
- Surface
- Vinyl
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
Test after adding and waiting 15 mins to mix to confirm the addition. You might have old chlorine.
I bought the chlorine a week ago and stored it in a dark storage room in the basement. 15 mins seems short but I’ll try it.
Yes, initially it depletes very rapidly. Continue the SLAM procedure by getting FC back to 24 and holding it there until the SLAM is complete.
This thing is eating chlorine. Just tested and got 0 FC, 0.75 CC (it was tough to tell if I needed that second drop to clear the R-0003). Water is crystal clear. Gonna have to go buy more bottles, only have 2 gallons to add right now.
BTW I checked the bottles and all the dates are either 5/24 or 6/2
Tested 30 mins after adding 2 gallons of 12.5% and got 9 FC, 0.75 CC. Considering the expected was 11.5 FC that gives me confidence my LC isn’t bad.
Understandably the FC this morning was 0 but look how the CC got lower which means the attack is working.
Just tested at 5 FC and 1.5 CC at 8:45 and immediately added 3.3 gal more targeting 24. Should I be re-testing and re-adding every hour even during the day? Asking because I know the sun breaks it down. I’m at 15.3 gallons of 12% in 2 days so far.
- Jun 8, 2019
- 4,576
- Pool Size
- 20000
- Surface
- Vinyl
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
If you can, yes. Life is a thing and not everyone can add during the day but the more often you add the quicker the SLAM will go.
The chlorine use will go down some as whatever is eating it up in the water dies and you're just dealing with sun loss while you filter.
here was my night time test + addition + test. dare I add another gallon? this is starting to get frustrating.
- Jun 8, 2019
- 4,576
- Pool Size
- 20000
- Surface
- Vinyl
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
You’re killing off the remaining stuff in the pool. Add enough to get to your SLAM level - FC usage will drop as the algae dies and stops multiplying, and you are just filtering out the dead stuff. 
You have to keep the SLAM up - the M in SLAM is for “maintain”
Read this thread for inspiration
www.troublefreepool.com
Read this thread for inspiration
SLAM Hangover
Hello all. I want to thank all the people on TFP who generously help out everyone with their pool issues! Just wanted to post my SLAM and what comes the morning after... :) a couple questions. I have a 35k "L" shaped vinyl SW pool, this is our 3rd year opening and algae was like none other...
www.troublefreepool.com
Appreciated this. Here’s the latest:You have to keep the SLAM up - the M in SLAM is for “maintain”
Read this thread for inspiration
SLAM Hangover
Hello all. I want to thank all the people on TFP who generously help out everyone with their pool issues! Just wanted to post my SLAM and what comes the morning after... :) a couple questions. I have a 35k "L" shaped vinyl SW pool, this is our 3rd year opening and algae was like none other...
- Jun 8, 2019
- 4,576
- Pool Size
- 20000
- Surface
- Vinyl
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
So you went from 18 FC after dusk yesterday to 10 FC at 7am - probably some sun on the pool by then but that's a pretty big drop for just an hour or two of sun. The chlorine is still killing things for sure. Keep the FC elevated and let it do its job! Test as often as life allows and add more FC back to SLAM level when you do. Keep brushing/vacuuming/filtering.