** Important **contamination during inoculation is a significant challenge in mushroom cultivation. Contamination during inoculation is by far the reason. Poor sterilization, using contaminated spores or mycelium, contaminated working environment, inadequate cleaning of hands or tools, and opening the inoculation container in an unclean environment. All our bags / jars are heated to 15psi 90 min in a Autoclave to ensure the customer has a clean start.. Feedback extortion will not work just return. If for any reason our customers are unsatisfied We Guarantee your money back.