Poland has had to develop under a lot of adversity and develops creative ways to solve problems. I always felt the dumb Polish jokes were made because of our desire to drink to have fun and the dumb things drunks do instead of day to day life where people look for creative ways to solve complex problems. Also this method insures the water is very safe and sadly in the US, the tap water we have wouldn't survive this way of testing, hence the fluoride in the tap water conspiracy. However nobody talks about the amount of industrial waste of human sewage that is dealt with in America so chemical cleaning is needed.