3 days now with my FC at 25 ppm or higher and no significant change. The green may have paled. CYA still at 100. A little more patience and persistence? or is water change a must? If I get a chance I'll post pics tomorrow. I haven't done a backwash yet. The pressure only went up about 5, but thinking maybe it would be good to go ahead and do a backwash. Have swept/broomed the pool everyday. Yesterday just left the "lil shark" work, maybe that's not as good? It has been raining off and on too. Is that setting me back?