I used to be dry tumbler, 3 tumblers going pretty constantly, a big Dillon doing a pre-clean, a Frankford Arsenal doing a main clean and then another cleaning the lube off my loaded rounds. But then I got a nice lead test done and triggered a big health Canada investigation as to why my lead levels were so high, they figured had to be work related. During the investigation we tested the floor around my tumblers and bench, which of course came back with a high lead level, we then went 3 floors up to my spare bedroom and tested the dust, almost the same levels of lead in that dust. My first response was to get a RCBS enclosed media separator and then wet the media down and use dryer sheets in the tumblers and to wear a respirator when separating. This helped, but there was still dust being tracked throughout my house. I finally bought a stainless steel wet tumbler, the Frankford Arsenal Rotary Tumbler (FART as it's known on many boards) and never looked back. Yes there is a tiny bit more time spent getting the cases dry, media separation and rinsing is a bit longer than with dry as well, but the end result is worth it. All the crap goes down the drain and not up into the air. Our city can handle the waste, so I'm not worried about that. I now have incredibly clean, shiny brass and no more lead.