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If you have an electric kettle, you probably have a filter like this built into the spout to remove particles of limescale.  Another method of filtering, chemical filtration, involves passing water through an active material that removes impurities chemically as they pass through.

Reverse Osmosis Systems. ... Reverse Osmosis Systems will remove common chemical contaminants (metal ions, aqueous salts), including sodium, chloride, copper, chromium, and lead; may reduce arsenic, fluoride, radium, sulfate, calcium, magnesium, potassium, nitrate, and phosphorous.

Bottled water retailers are well aware of the quality of our nation's tap water in fact, at least 24 percent of the bottled water we drink is actually filtered tap water. Pepsi's Aquafina and Coke's Dasani, the top bottled water brands in the country, are two of the brands that bottle filtered municipal water.

A water filter removes impurities by lowering contamination of water using a fine physical barrier, a chemical process, or a biological process.

Reverse Osmosis is a water treatment process that removes contaminants from water by using pressure to force water molecules through a semipermeable membrane. During this process, the contaminants are filtered out and flushed away, leaving clean, delicious drinking water.

Water purification is the process of removing undesirable chemicals, biological contaminants, suspended solids and gases from water. The goal is to produce water fit for a specific purpose.