I like the big chunky perilite. For years I used tons of perilite and got shit from alot of people saying it was a crutch and only inexperienced people used large amounts of perilite and blah blah blah. Bottom line perilite and marijuana go hand and hand. I like to get runoff easily to reset the medium every watering and so I can feed more often. Also the roots love the stuff. And perilite holds alot more water than people know. I've gone with 30% coco and 70% perilite and had awesome plants. That with a drip ring watering 3 times a day grows a plant very very fast. Where did you get that big chunky stuff? I've got it off Amazon but it's exspensive.