<https://sciencing.com/water-cleaned-5158828.html>
<http://schema.org/description>
"Groundwater can get polluted in various ways. The most common culprits are leaking underground storage tanks, landfills and hazardous waste sites. Wastewater which is not treated properly at treatment facilities is also another source. \r\rThere are two methods of cleaning water, chemically or by natural means. The water for drinking, bathing and washing is treated in a water treatment plant. This water is cleaned through several steps, the first of these being screening. Here the water flows through a pipe with a screen, which acts as a sifter to remove the larger objects in it. \r\rThen there is the flocculation or clarification, where chemicals are added which separate the smaller particles that were not eliminated during the screening process. The third process is filtration, wherein the water passes through fine sand which traps whatever remains of the chemicals used in the second step. \r\rThe last and final step is the chlorination. Chlorine is added to the water to protect against any bacteria or other pollutants that may still be in the water. At all stages in this process, samples of the water are taken and tested to assess whether the procedure is effective and the water is getting cleaned in a proper manner."
<https://sciencing.com/water-cleaned-5158828.html>