I've been using the BBB method this whole season and have saved a ton of money! Thank you so much for educating me! I have noticed however, that my stairs seem to look more yellow than they did before I began. Could the bleach be causing this? I was using trichlor before and wondering if that would cause the same yellowing. My chlroine levels fluctuate between 4 and 9 as I add two 182 oz. jugs of bleach every other day. My CYA is about 80 and ph is about 7.6. I live in the Southern U.S. so have lots of intense sunlight this time of year.