I have a 16 X 48 Intex pool with a Krystal Klear saltwater system and sand filter/pump system. My pool is in full sun all day and I run the pump 8 hours and the saltwater pump 7 hours. Although all my other chemical levels are fine via the test strips, I consistently have low chlorine levels. I shock weekly and more as needed. Is there a way to determine if my system is working correctly? I started supplementing with chlorine tabs to prevent algae buildup.