We currently have crystal clear water but have needed to increase the output on our SWG to keep the FC above the minimum per the FC/CYA chart. The pool water is in the range of 84-86 degrees and is in full sun for about 60% of the day. I don't remember having the SWG at 50% or more last year (1st season with pool) to keep the FC above minimum. I noticed that the floor was slippery this weekend prior to cleaning and brushing. Could I be on the verge of an algae outbreak? We will do an overnight FC test tonight and post a complete set of results tomorrow. Is it normal for SWG's to have problems keeping up the FC level during the summer?