i don't think it naturally becomes clean until you heat it, catch the steam on a cold surface and then the condensed droplets are pure clean water
The water becomes clean underground as it percolates through sand and gravels.
clean water is naturally dirty, it goes through a process in which then it becomes clean.
Crystalisation
A sea mount becomes an island when part of it extends above the water on a permanent basis.
Water is salty in oceans. Much of the water is polluted. Hence, it becomes difficult to find clean fresh water.
water comes from the sea and the filter it and add chemicals to clean the water.
Wasting water means wasting energy. When the water you waste goes down the drain, that means the energy that was used to clean and filter that water went all to waste. The water goes back into the ground, and it takes even more energy to filter and clean it again. Some water also ends into the ocean and since it takes time for the flow of salt water to become clean water, our amount of clean water will decrease. So basically every pint of water that you waste ends up into the ground, sea, river never becomes automatically clean again.
Up your bum.
Floods, of course. Sea water becomes big like waves (tidal waves), in the sea whoch lead to floods and thus, pushes sea water out under pressure.
They get drinking water from their starting ports and pool water from the sea(they clean it out first)
it ussalt takes about 5 years to make it completely clean of oil... and they clean out the water by water pump ship that clean out the water. as for the dead fish they have other boats net them out of the water...
The frozen fresh water that forms the ice sheet -- covering 98% of Antarctica's surface -- is exceptionally clean. The sea water that surrounds Antarctica is also clean,, requiring no more than removing the salt to make it potable for human consumption.