MADE-TO-ORDER: Ready in 1-2 weeks MUSH FLUSH™ Pasteurized Mushroom Substrate Elevate your mushroom cultivation with our MUSH FLUSH™ substrate bag, meticulously crafted for dung-loving fungi. Our blend combines horse manure, vermiculite, gypsum, and coco coir. We pasteurize this mix at 206°F for 12 hours, ensuring a pristine growing medium for your mushrooms. Each bag is carefully sealed for freshness and effectiveness. Versatile Use: Ideal for monotubs, outdoor beds, or direct growth in the bag. Simply introduce your colonized grains into the bag in a sterile environment and reseal it. Recommended Grain Spawn Ratio: Use 1 to 1.5 lbs of colonized grain spawn per 5 lb substrate bag.