The aluminum caps were short lived. We got 10 to test and once it was announced we got tons of emails and complaints that they were "unsafe" but then got tons of emails and complaints saying they were. I couldn't find anything conclusive one way or another, but we decided that with all the different opinions we will instead to Stainless Steel caps instead. Just have to wait until we can afford them!
Yes, some grades of aluminum are safe and some are not. Some contain lead. You just have to know what grade you are working with. Don't blame you though. Some lower grades of ss are also not without risk, but I'm sure after having to back out of alum, you are doing your research. Can't wait to see them