I'm in the Northeast, but I think it's the same ingredient as the name brand sedgehammer in all the Sedge killers. It's pretty harmless, comes and goes each year. As long as it doesn't spread too thick I've leaned to mostly ignore it. Bigger patches I spray...sulfentrazone (without googling I think that's the chemical) #lawngeek
Those little spray bottles can get a expensive, get yourself a concentrate bottle and mix it in a sprayer.