Thanks.

I had come to the same conclusion- that 400 was not too high to worry about. My CYA is 75 & I'm using about 182 oz. of bleach a day, sometimes a bit more (364 oz.). I have been thinking of raising the CYA a bit higher (85-90) to hopefully use less bleach as you had suggested a while back, since my pool gets full sun all day.

What do you think?