Re: Clear, but no chlorine???
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Was the 32 FC result at 12:30 BEFORE adding anything?
In other words, is this scenario correct:
7:30 you were at FC 22; you added 2-1/2 jugs
12:30 retested FC and got 32. No additions from 7:30 to 12:30
I just want to make sure about this because if this scenario IS correct..... your results are promising.
You only have to do the “wait an hour and retest” at night when you’re trying to determine overnight chlorine loss. I wanted to make sure you understood the AT NIGHT part.

Originally Posted by
mary jo
At night, dose the pool with bleach to get a FC of 30, wait an hour and THEN take another reading for the night. Sorry, my brain is slow.
26K gal 20x40 rectangular IG vinyl pool; Apr 2014: New pump, liner, auto-cover, & water; Pentair Whisperflo 1HP pump; Pentair Trition sand filter; Cover/Star CS-500 auto cover; Taylor K-2006C; OTO
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