leaching

Hi, I bought this cheap 2000W element on Amazon (25$~30$). The material is nowhere mentioned, but the element is meant to boil water (for tea/food), so I assumed it would be okay to use for brewing. Last time I used it, it turned like this. Would you still use it or should I dump it ? 🤔

We need to upgrade the transfer lines from the sparge water to the Mash tun. I'd like to solder some copper joints. If these joints heat, as the will when heating, I’m thinking there might be concern about the tin and antimony leaching out, or the joint softening. There will not be water in...