i have applied the cutrine granular a few times, but it doesn't seem to be knocking it out. i can tell some of it is turning a lighter color, but some looks perfectly healthy. i pulled a larger stone out of the water today and i believe i saw some of the granules sort of stuck on it, is that normal? does it take a while to melt?
water temp is mid 50's now. would it be ok to treat again?
