Hello R2R Friends, what is your experience with dirty salt bins?? Mine would get dirty from time to time using IO regular and RC and coralife salt brands. Of course we know those salts will leave the bin dirty over time but I switched to tropic marin awhile back and in my mixing bin that has only seen tropic marin salts it has finally gotten dirty!!! We've seen before from other people that TM pro does not leave your bin dirty at all. My question is has anyone ever used the "store use" bags before, that is what I use? They use mag flake in the bags for stores because it makes it a bit cheaper than the Pharma grade magnesium salts and I'm starting to question if its a dirty magnesium just like every other brand. Most if not all magnesium mined from the earth is extremely dirty. What are your thoughts?