From the discussion of the "smart soul" that saves water

Diamond: In Germany suddenly decided to save water.
They conducted a corresponding explanatory campaign, hung everywhere “social advertising” that water should be saved, brought to the stores “smart” buttons to regulate the amount of washed water in the toilets, shower heads with smaller holes, economical washing machines and dishwashers, etc.
People really began to save water, water consumption decreased several times.
Later it turned out that the water used by economical consumers is not enough for the normal functioning of sewerage and treatment facilities, and it is necessary to specially pour the missing volumes of drinking water into the sewerage.
And, yes, although people began to save water, in monetary terms, savings did not show themselves, as tariffs increased accordingly - the cost of water in the final price for the consumer took a small share.