Plating Solutions

I have purchased a plating machine and am anxious to try it out. I
want to do some silver plating on a sterling silver ring, to give it a
brighter finish. My question is this. When you use the solution for
plating, do you put the used portion back into the original bottle for
storage? — or does this contaminate the unused solution? How long
can solution be used?I have read several post on plating, but have
not seen this addressed. Any help? Would appreciate input on storage
and useage of plating solution.

Thanks, Joe