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2. Do You Really Need a Water Filter? - AOL

   www.aol.com/lifestyle/really-water-filter...

   They do not, however, filter out viruses and bacteria. Other filters need a plumber or a home handyperson to install. They sit either on the countertop or under the sink, at just a single faucet ...

3. Water filter - Wikipedia

   en.wikipedia.org/wiki/Water_filter

   Water filter. A water filter removes impurities by lowering contamination of water using a fine physical barrier, a chemical process, or a biological process. Filters cleanse water to different extents, for purposes such as: providing agricultural irrigation, accessible drinking water, public and private aquariums, and the safe use of ponds and ...

4. Water purification - Wikipedia

   en.wikipedia.org/wiki/Water_purification

   Many household water filters and fish tanks use activated carbon filters to purify water. Household filters for drinking water sometimes contain silver as metallic silver nanoparticle . If water is held in the carbon block for longer periods, microorganisms can grow inside which results in fouling and contamination.

5. Federal Reserve Surprises With Hefty Interest Rate Cut - AOL

   www.aol.com/federal-surprises-hefty-interest...

   The Federal Reserve raised eyebrows Wednesday with a bigger-than-expected cut in a key interest rate, portraying the move as essentially an insurance policy against a possibly slowing economy now ...

6. Slow sand filter - Wikipedia

   en.wikipedia.org/wiki/Slow_sand_filter

   Slow sand filter. Slow sand filters are used in water purification for treating raw water to produce a potable product. They are typically 1–2 m (3.3–6.6 ft) deep, can be rectangular or cylindrical in cross section and are used primarily to treat surface water. The length and breadth of the tanks are determined by the flow rate desired for ...

7. Water softening - Wikipedia

   en.wikipedia.org/wiki/Water_softening

   Water softening. Idealized image of water softening process involving replacement of calcium ions in water with sodium ions donated by a cation-exchange resin. Water softening is the removal of calcium, magnesium, and certain other metal cations in hard water. The resulting soft water requires less soap for the same cleaning effort, as soap is ...