Separate names with a comma.
Probably welding slag or fragments from the weld itself.
It either came with the sand or was in the tank. Sand doesn't really react with much.
Just had a goofy idea —- thinking of adding a air inlet to my HF blast cabinet and hooking it to the exhaust of my 18 gallon vac. Then let the outlet of cabinet blow through a hose to the outside of the building. I would think this would eliminate the vac filter from clogging and the need for a dust trap. Has anybody tried this ??? Give me your thoughts. Yote
youtube has several hf blast cabinet updates.
You should either be filtering/trapping or "something" to capture the medìa. A 5gallon pail can be modded to work as a trap also.
That is how I hooked up mine, it will suck the plexi-glass down, but keeps the cabinet clear. But on the down side, ask Santa for a shop vac every Christmas, I on average burn one up at least once a year.