Germans have been educated to save water, with good results. Water saving insanity makes Germany’s cities stink.
Toilets that have two flush buttons so that you have the option of using less water if there’s less to flush away is just one example.
However, the resulting reduced flow through the sewers has led to problems such as some materials not being transported away properly, germs multiplying, or gas forming.
The result: cities often use large quantities of water to flush out those sewers… often using drinking-quality water. Thus essentially negating the advantages of saving water.