Carbon Filter (Does NOT Kill Bacteria)
These filters remove some chemicals by passing the water through an activated carbon filter. It is best at removing tastes, odours and organic chemicals.
Reverse Osmosis (Does NOT Kill Bacteria)
Some chemicals are removed by passing the water through a semi-permeable membrane. It is used for removing inorganic chemicals, such as nitrates, and is frequently used in combination with carbon filters. Water should be filtered before treatment.