I've never actually used kool bloom but they seem 2 be both bloom bosters.. I've used mOAB & over drive at the same time but I used 1/2 of each instead of full strength with each.. I've never tryed kool bloom & over drive.. So I can't say..thanks for the advice do you know if kool bloom is the same as over drive? or do i use over drive week 6, kool bloom week 7 then flush?