I have some stuff in the bottom of my pool. It could be sand, it could just be dirt, it could be stuff falling off trees. It could also be algae. It certainly isn't bad, there are spots here and there. it is easily kept under control with vacuuming once a week. Testing shows FC at 2-3 consistently but CC is 0. I test in the AM, the SWG stops around 4:00 PM the day before the test. Should I be worried? Should I have the SWG run longer? I forgot to add that the water is crystal clear.