No flow hood? No problem. Here’s how a simple plastic tub gives you laboratory-grade sterile conditions — how to build one two different ways, and how to work in it so your contamination rates drop through the floor. There’s a moment every new cultivator reaches where enthusiasm meets reality. The grain jars are ready, the culture syringe has arrived, and then comes the pause: the kitchen counter doesn’t feel right, the bathroom feels wrong. You know contamination is the enem