They brew organic compost tea that has all of the beneficial bacteria. I was told to add it to my ebb and flo reservoir and it made the res smell like top soil. My plants immediately blew up! This stuff is fantastic and is the only way to mimic soil growing in hydroponics, taste is soooo much better now, my friends think I switched to soil. I recommend it to everyone, hydro growth with soil quality, it doesn't get any better. This is the only grow shop in the area that brews it.