When I set up my foundry I didn't know anything but was reading some. I thought I had seen a sand heap in a box under a molding bench so that's what I built. I made it waterproof with a lid with a seal and my sand stays moist for a long time. Before I got the muller I was mulling by turning the sand several times with a shovel. That worked good. With the muller I find it slow to load (so I made an extended funnel) but the sand dumped under the muller and had to be scraped out of the muller bin. I added a couple of brackets to the muller tub and removed the bin. Made a bracket to hold the muller The muller clears the storage shelf by a little. This is it's stowed position. It's out of the way while using the molding bench It can be swung around to load so any spillage goes into the heap storage And swung on around to dump the mulled sand directly into the heap. My heap storage and bench design is different but I can tell it's going to work for me. Next I think I need to make a metal tray to deflask the sand into so it's ready to load into the muller. Been thinking about making an aerator but I think I can use the muller effectively. It does create nice fluffy sand.