Hope I didn't miss something from before, but to make sure we're all talking the same thing .... 24 gallons at one time? On the Poolmath calculator, TWO gallons takes FC in a 20K pool from zero to 10. So I would think you only need to add 2 gallons to start the ammonia purging 10-min drill:
1. Begin a SLAM and dose FC up to SLAM level. If your CYA test is showing as zero (perhaps already converted to ammonia), use a SLAM/Shock FC of 10. Do not add additional CYA at this point.
2. Retest FC at 10-minute intervals.
a. If FC loss is greater than 50%, add FC to bring back up to SLAM level and continue retesting FC @ 10-minute intervals.
b. IF FC loss is 50% or less, add FC to bring back up to SLAM level. Go to Step 3.
3. If CYA is below 30 ppm, add enough CYA to bring level up to 30 ppm.
4. Continue SLAM as directed in the SLAM article until the SLAM Criteria of Done are met. Test as directed in the SLAM article - no longer need to test FC at 10 minute increments at this point.
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24 gallons would take you FC to 120 and probably bleach your liner.
I was told by the poster in this thread that I have to be at 10x FC the ppm of the ammonia...Is that wrong?
Mod note: The chlorine needs to be added on an as need basis according to your test results. Kim
If I read you correct, that I would dump 2 gal in. Test immediately the FC. Wait 10 min and test again. If I lost more than 50% of the FC than dump more to bring back up to 10ppm, then wait 10 min, test and if loss is greater than 50% repeat. If I don't lose 50% then monitor and add Chlorine as needed to maintain?