When I first got started a friend gave me a formula to make my medium that called for Bat Guano and other stuff. Did 1/2 with that and then got lazy and did the other 1/2 with just sunshine #4 and House and Garden ferts only in Bud. I like the Sunshine mix and it was easy, tasty and works. Had a local dispensory offer me $225 oz. and he said that was the top price he donates to the cause. Made me feel good but I don't sell anything.