Hi everyone

I splashed out and got myself a barrel tumbler and it has been worth its weight in gold (excuse the pun). It works a treat but I noticed this morning that some of the shot pieces have gone rusty. I followed the instructions which said that when not being used its OK to leave the shot in the barrel bright as long as they are submerged. Is this not the case? Should I take the shot out, dry them and throw out the liquid every time?

Thanks!