Swimmers in Austria are being asked to keep their mouths shut at public pools to save money.
About 5,000 litres of water a day is thought to be swallowed by visitors to Vienna’s 18 baths.
Officials say the cost of replacing it is high, especially because swimmers are flocking to pools in the current heatwave.
Replacing that much water also has an environmental as well as financial cost, authorities say, due to the need to chemically treat the water.
Austrian pool managers have previously tried to ban Bermuda shorts from their pools due to the extra amount of water they absorb and take with them when the swimmer leaves the pool.
Here is a better idea: ask swimmers to shut their mouths AND help fill the pool instead. That would solve the problem... the pools would get deeper and no one would want to drink the water.