Filtered water for long periods of time

Scientists found that, if you put a cup of water outside overnight, its chemical composition may be changed so that the next morning when you drink it, it will taste slightly different.

Explaining the cause of filtered water for a long time was "thiu"

Usually food or drinks can be chemically altered after leaving some time outside of the air, resulting in their taste being changed or worse, unusable. As we often say they are stale.

However, a recent study has demonstrated that even filtered water can become stale when left outside. Scientists found that, if you put a cup of water outside overnight, its chemical composition may be changed so that the next morning when you drink it, it will taste slightly different. If you are observant, it will taste slightly sour.

That is why some types of bottled mineral water have a shelf life. Although water does not contain proteins and sugars like food or other drinks, it causes bacteria to break down and make them stale. But the water is in a different way.

Basically, the chemical composition of the water does not change, but if you put water in a glass cup overnight, it will absorb some carbon dioxide (CO2). A small amount of CO2 absorbed into water is converted into carbonic acid (H2CO3 ).

This reduces the pH of the water and makes it slightly acidic. However, you do not need to worry too much because according to scientists, this change does not affect your health when you drink that cup of water.

However, if you continue to keep the water out of the air for a while, it will be a good condition for the bacteria to grow, be it algae or the environment for mosquito breeding. That's why old sailors often store beer or rum on board during long trips instead of water. Because beer and alcohol are bacteria that cannot grow.

As for bottled mineral water, it can in fact be safe indefinitely if properly stored. Because these types of water are often packaged in plastic bottles, most plastics and plastics can be chemically altered if exposed to hot water, creating hormonal disruptors called bisphenol A. .

That's why you should not put these water bottles in the sun or near other heat sources. Even so, long stays in plastic bottles can also cause the water to change its taste, so manufacturers still set expiry dates for these types of water.