What about carbon filters?

Carbon filters

Most granular filters cannot remove everything, some will not even remove microbes.

Under the right conditions (age and length of use), any carbon filter can become a breeding ground for bacteria!

There are many small filters that fit onto the end of sink taps and water pitchers with small built-in filters. These are not effective since they are so small and the water spends so little time in contact with the carbon, that almost no contaminants are filtered out! All you may get is slightly better tasting water for a while.