I thought I would share with this forum my first notable failure (in regard to treatment of swimming pool water, that is!)
Late last week, a routine chlorine test detected a low level of chloramines (0.2 ppm); this is a rare occurrence in my pool and I've always been able to dispense with such annoyances quickly by throwing in a 10 oz. bag of TriChlor powder (67% available chlorine) or setting my SWG to "superchlorinate" for 20-30 minutes. It works so well, I don't even bother to test the outcome until the next regularly scheduled test.
This time proved different. Some will ask themselves why I even bothered to shock for chloramines given that many test kits won't even register a reading of .2 ppm. I hope you won't think my answer lame (or arrogant) but it's simply this: Because I can.
Anyway, pride goeth before a fall. Here is a summary excerpted from a two page log I created over the weekend that details my folly. If you're tempted, feel free to read this inglorious account (Excel spreadsheet) of how my beautiful Labor Day Weekend was swim-free but not stress free, and the result of which will likely be a partial draining of my pool. Enjoy.Summary - Though never an issue before, numerous shocks have failed to clear chloramines from the pool. First noted on Sept 3, 2009, these events unfolded following the months-long slow increase of Total Dissolved Solids (to > 5000 ppm by 8/25/09) and then several purposeful additions of CYA over the course of the summer, including two in the month of August, in the hope of raising CYA from the 40-50 range into 60-80 territory, as recommended by nearly everyone. Chlorine levels also climbed precipitously throughout the month of August, from an average of about 2 ppm held since January. CYA prior to August had been low 30-40ppm. Efforts to shock have failed. I can drain the pool or hang myself. I choose to swim again....