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2. Sand filter - Wikipedia

   en.wikipedia.org/wiki/Sand_filter

   Cooling water production, drinking water preparation, pre-filtration in active carbon treatments and membrane systems, and the filtration of swimming pool water. Iron-removal from groundwater using aeration and sand filtration.

3. Clarifying agent - Wikipedia

   en.wikipedia.org/wiki/Clarifying_agent

   For example, a flocculant may be used in swimming pool or drinking water filtration to aid removal of microscopic particles which would otherwise cause the water to be turbid (cloudy) and which would be difficult or impossible to remove by filtration alone. Many flocculants are multivalent cations such as aluminium, iron, calcium or magnesium. [1]

4. Water filter - Wikipedia

   en.wikipedia.org/wiki/Water_filter

   Filters use sieving, adsorption, ion exchanges, biofilms and other processes to remove unwanted substances from water. Unlike a sieve or screen, a filter can potentially remove particles much smaller than the holes through which its water passes, such as nitrates or germs like Cryptosporidium.

5. Swimming pool sanitation - Wikipedia

   en.wikipedia.org/wiki/Swimming_pool_sanitation

   An electrically operated water pump is the prime motivator in recirculating the water from the pool. Water is forced through a filter and then returned to the pool. Using a water pump by itself is often not sufficient to completely sanitize a pool. Commercial and public pool pumps usually run 24 hours a day for the entire operating season of ...

6. Water purification - Wikipedia

   en.wikipedia.org/wiki/Water_purification

   Complete removal of ions from water is possible if the right conditions are met. The water is normally pre-treated with a reverse osmosis unit to remove non-ionic organic contaminants, and with gas transfer membranes to remove carbon dioxide. A water recovery of 99% is possible if the concentrate stream is fed to the RO inlet.

7. How to remove hard water deposits from your faucets and shower

   www.aol.com/remove-hard-water-deposits-faucets...

   Hard water refers to water that contains a high amount of minerals. Water picks up impurities very easily as it moves through the rock and soil. Calcium and magnesium are the main culprits when it ...