I have had my SWG now for a month, and I have algae. I have been running it 12 hours per day at 50%, with a constant 3.5 FC level. My CYA is 70. Do I need to take the chlorine level to the recommended FC level of 5? It seems those who post information about SWG's run their chlorine levels lower. Is it necessary to run the high CYA level for an SWG? Aren't chloromines zapped as they pass through the cell? Is that why some run the chlorine levels lower? Thanks, Dorie