What is in water that makes it need to be filtered? 10pts

Filtering removes particles - meaning dirt and bugs and, if the filter is fine enough, germs.
An ion exchange filter can remove salts or other dissolved chemicals or non-polar contaminants.

cretain types of fertileizers can get into the ground water that we use out of the faucet. soon depending on where you live theground water may need to be filtered a lot or not so much

Impurities