Check my mustard thread...I used sodium bromide and kept the FC above 12 and had good luck. Before treating, I kept the FC above 10 for about a week, then added 4oz per 10gallons and added 1 galon bleach per 10k to kick the stuff into action. Then kept hitting the pool with clorox for 4 or 5 days to keep the levels above 12ppm...which BTW was alot more clorox than i thought it would be because the SB eats clorox like crazy. I seem to have kicked...no algae in sight for the 3rd morning....