They never had the supplies to clean it out.
The principle is 'dilution': with the first addition of clean water to dirty water, the dirty water becomes less dirty because it is diluted by the clean water. With the continued addition of clean water to dirty water, eventually the dirty water will be completely diluted and there will be no dirty water left; it will all be replaced by clean water.
to clean dirty water it needs to be cleaned or filtered
clean water is naturally dirty, it goes through a process in which then it becomes clean.
dirty
They had nothing else and they didn't know that water carried disease.
In clean water.
Fresh water is not dirty because it is fresh and clean
no there have really dirty water . so dirty there died
it get's clean by sewige
Clean water is evaporated faster.
filter