The great news is that I don't have a problem (that I know of)! I started the BBB method in June with a good shock to about 22 ppm. It fixed everything. We've stayed in control for the whole summer doing nothing more than adding bleach and acid. My question - is there a point where I should shock anyway? I have no CC and keep the pool between 1 ppm and 6 ppm (check every 2-3 days and add bleach to 6 ppm). I've been going under the assumption that no CC, no algae, clear water and no problems means I don't need to anything more.
Current readings (before bleach and acid charge today)
15000 gal pool, plaster, cartridge filters