I used the HTH Green to Blue. The first steps were great. Then came the red/brown FLOC! I have managed to get it to stick together some using something my pool store (this is not a chain but private owned) recommended. I have vacuumed to waste several times and have had to replace at least 7 inches of water so far. I still can't get this dusty powder out! Please help! I am at my breaking point.