This is a blast from the distant past for me. My dad was a chemical engineer, and we lived overseas when I was a little kid, in a hot country where residential pools were rare as hen's teeth. He had a mate who was a right and proper British aristocrat, High Commissioner or somethingorother. When we would visit, they sometimes worked on a tank that was going to keep his swimming pool clean. They were mucking around with wires and water and salt and I remember my mother laughing and saying they're both mad to be doing that. I loved the pool, but it all made zero sense to me and I went back to playing with the dog, because we weren't allowed to swim while they were experimenting, haha.