With water bowls made from corten steel one has to take into account that the water might turn a little auburn – as long as a stable barrier coat on the metallic surface has developed. With water bowls made from corten steel, that are not emptied at least once a week and therefore cannot dry completely from time to time, the metal can rust through just like other metal, too. Our water fountain AQUA BOWL is therefore designed that all water drains off into the water storage tank once the water supply is stopped. But: If you plan continuous operation, we recommend to use a clock timer, so that the bowl can completely dry off at least once a week.