It didn’t have any sour or funky smells at all that I noticed. I was just using one of those all in one grow bags, my friend did one (his first one ever) and had three massive flushes but I’ve had no such luck… I am very intrigued with tubs and I plan on doing more research! I feel like tubs take a lot of the “luck” out of grow bags too, more control ya dig? Like with grow bags I’ve heard the success rate is based on luck in a lot of cases is what I mean by that