I don't know if it is just my aging eyes but they are not very tolerant of the pool water this season. They start to sting within minutes of swimming under water. I always assumed it was PH and chlorine that were the biggest factors in eye comfort but I am beginning to wonder. Last night's numbers were CL = 5-6, PH = 7.4, TA = 120, & CYA = 30 (maybe less). I have been keeping my chlorine on the high side due to a tendency to mustard algae. From what I've read here, 6 is not a huge number so I don't know what is new this year. Anything else I should be watching?