I shocked on Sunday night with 6.75 gallons of 6% bleach which should have brought my FC to about 16. My numbers before shocking were:
I puposely brought the Cl levels down to do an acid treatment on a suspected stain. I did the treatment on Thursday morning. On Saturday evening, I added 1.5 gal of 6% bleach and had .5 FC and 1.5 TC, so I suspected there was something besides the sun eating my FC and decided to shock on Sunday night. After coming home from work on Monday evening (I didn't have Columbus Day off like my kids and the Gov't), I tested the water and got these results:
It was very hot yesterday, so I expected some burn off. Unfortunately, I couldn't do anything during the day to try to keep the levels up as I was at work and my wife is 38 weeks pregnant. I plan to test again tonight, but it seems that I need to shock again as I plan to keep the pool open just a few more weeks to be able to do some laps at night and use the spa....hopefully my wife will be able to use the spa a few weeks after giving birth before we close up for the winter. Thoughts?
P.S. - I found some really cheap 6% bleach at Aldi ($0.99 for 92oz)