I run my CYA at 35-40 PPM with 2.5 PPM free chlorine. Pump is set on low speed for a run time of 12 hours each night with Aquarite set at 40%. The system manages to maintain levels even after the heaviest rains. Pool has been crystal clear since startup. Just got a free pool fill up yesterday with 3 inches. Nice to see some rain during the summer in south Texas.