At a loss
So i drained my pot thinking it was just a dirty alloy. Put it into a cast iron pot remelted fluxed and cleaned the whole lot. Put it back into my production pot to cast some more. Low and behold not 20 min in it starts crusting up. This is not a light crust it's like I am pouring brownish redish green sand on top of the melt. It's starting to perplex me it didn't do this outside of the production pot so what am I doing wrong.