Peggie, You recently answered a question for me about the use of vinegar with an aluminum holding tank (you said it is OK since it is non-corrosive). I can undertand minerals being in salt water, however, since I ONLY flush with fresh water from the head sink, will I still experience mineral build-up (are there enough minerals in the *deposits* to matter)? Do you still advise using vinegar in my case? Thanks.
