Great site. Found it last year and my compliments. Here is my story.
First the good stuff.
Above Ground Pool 18 x 33 ~ 16,000 gals - Vinyl Liner - Constructed last year.
DE Filter - Full Sun 75% of the day.
I was given free Baquacil chems and used them for the first season last year. No problems at all. Started this season with a good start and then the pool got cloudy about June. Used up all the remaining Baq chems I had and then decided to convert to BBB. Dumped in bleach, watched the pretty colors and then the water was clear. Had tons of Baquagoo and vacummed it all out. Changed DE about 3 times and then pool was crystal clear. DE filter has been running great for about a month with no pressure increase. Pool has been crystal clear ever since.
I have the Taylor Test KIT which can check for PH, CL, TA, CYA and CH. So here are my current #'s.
PH - 7.4
FC - 0
CC - 2
TA - 70
CYA - 60
CH - Low - doesn't really bother me since I don't have a plaster pool
I am using 12.5% liq chlorine which I add about 50 oz every other day.
After reading everything on this site and the conversion instructions I am still stuck on why my CC is still high. After I add the liq chlorine at night and test about after an hr and my FC is about 3 and my CC is 5 which is what I expect. The next day my FC is 0 and my CC is about 2-3. I know what I have to do is to shock the pool and raise up the FC high enough so I can pass the overnight test FC test. Problem is with only a few more weeks in my pool season (live in PA) I don't want to shock the pool only to tell the kids they can't swim for a few days.
Here is my question.
What is the problem with continuing on with a CC level that will not drop to 0 and my FC level that doesn't last?
I have no problems with the pool and the water remains crystal clear. I still add 50 oz of the 12.5% liq chlorine every other day.
My plan would be to shock the pool at the end of the season for closing and then deal with the CC at the beginning of the spring.