I have a 16'x32' doughboy AG. 13000 gal. I'm trying the BBB method. 2 days ago everything was where it should be. Today after 1/2" of rain, my chlorine is practically nonexistent, PH 8.2, and Alk of 160. What do I need to do?
I tested with a HTH 6 test kit from Walmart which is about as good as I could find around here without sacrificing a tank of gas for the week.
Help please!