Ughh - aluminum and cheese do not go together well in my experience. When I first started making cheese, just fresh cheeses, I used a stainless steel pot, but I unthinkingly used the aluminum colander that I already had. Even with cheesecloth lining the colander, I got a distinct metallic taste - fortunately faint, but definitely there. I bought a stainless colander, and the problem disappear. Absolutely no aluminum for me, from then on, anywhere involved in the cheese making process!