I have a side hustle growing microgreens for local restaurants and residents. I made a shelf system, for delivery, out of wood. It had four shelves high that were too close together and could only fit two flats per shelf. With maker pipe, I was able to get three flats per shelf and three shelves high gave more room between shelves. All in all, I could fit more flats. It's lighter than the wood shelf and easier to clean. The shelves are big box store closet shelving turned upside down to keep the flats from sliding off.