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So, your mushroom substrate block has given its all, and now it's time to compost it back to the earth. Composting your used mushroom substrate block is a great way to close the loop on your mushroom growing journey. Happy composting!

Take pictures first then discard whatever is contaminated. We're into researching mushrooms not bacteria. If the contamination presents itself after you mix the spawn and substrate and have assembled the tub then send us a photo and we'll help to identify and troubleshoot your problem. Make sure to sanitize your Apprentice tub with isopropyl alcohol or diluted bleach water thoroughly before storing and reusing. This will help reduce the risk of cross contamination with your future grows.