Thank you. After two days of heavy playing and swimming in the pool, my FC dropped to 5.0, pH level is at 7.4. I have not needed to add any bleach to the pool for over 1 1/2 weeks. Today will be another day of lot's of pool usage. I am sure that tonight I may finally need to add bleach. My pool has been a beautiful crystal clear. So clear that my youngest children said "it looks like the water in the Bahamas" Now that is definitely a compliment!!!!!