If you leave water in a ceramic, glass, or cup it will start to taste bad after a day or two, even if it’s covered with a lid. However, when we pour water out of a tap into a glass it will taste fine, even though it’s been sitting for days/months in a water reserve tank. Why is this the case?
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Water that has been sitting in sunlight will begin to harbour algae and moulds after a period of time. It will take a while depending on how clean your water is to start with, also there is gasses, minerals and other things that fizz off as it sits there. For example if your water supplier uses chlorine (this makes little dust particles and ‘bits’ clump together and get picked up by the many filters) then the slight smell of swimming pool will slowly disappear and the small amount of chlorine turns to gas and floats away, it isn’t unsafe to drink it before this happens.
Used to work at a UK not for profit water supplier for Wales.
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