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Same here. How do you dispose of the lead/baking soda waste?
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I bought the larger of the two harbor freight units and have used it exactly once to clean a sealed & "un-jail-breakable" integral 9MM LRM M16 upper with a decade of buildup.
https://www.harborfreight.com/40-lb-portable-soda-blaster-60801.html
I made a 90 degree nozzle out of an old M16 DI gas tube and used it to blast lead and carbon out of the interior of the can and then used a borescope to check progress.
I am on a couple acres and I set it up in the woods behind my house where the resulting mess was'nt as much of an issue to get tracked into my house, piss off my neighbors, etc. I also wore full PPE with a N95 respirator and goggles. I wouldn't do this in the driveway of your 1/4 acre lot with neighbors next door as it loud, messy, and if the neighbors kids/pets are tracking lead residue around into their house its going to be pretty bad on you as a neighbor.
My impression is that the non-blast cabinet based soda blasters create a significant mess which results in a mix of soda, lead, copper, and carbon vaporized into the atmosphere and that will cover not only you but a significant area around you in this dust. The other option is a dedicated blast cabinet to do this I don't see an way to reasonably contain the mess soda blasting creates.
I personally think the dip is a less dangerous method of cleaning if done carefully as at least its all contained and can be dropped off at a hazmat facility vs. the open air blasters most folks are using to clean baffles.
Granted in comparison to the dip's lead acetate this is just vaporized elemental lead/copper/whatever...but I would personally rather have lead acetate contained in a jar that all that other elemental heavy metal residue all over me, potentially my eyes and lungs, or in an area where it could get tracked into my house/car/workshop.
I also have a dual jar rotary tumbler, with one jar filled with stainless media and one with copper media (for aluminum) and much prefer that as a baffle cleaning method over open air soda blasting.
If you set up a dedicated blast cabinet and you could probably drop the media off at any hazmat facility or mix it into some sort of binder (like a bag of quikcrete) and dump it like normal waste. The other challenge is that many blast cabinets "leak" a bit to varying degrees so you are still going to get residue in your workshop to some extent.
Hope this helps.