natural ways to filter water - what is the best air purifier

According to the US Environmental Protection Agency (EPA), drinking water pollutants include Jia Di worm, cryptoworm, arsenic, lead, nitrate, pesticide and Ra.
According to the EPA, bacteria and viruses also contribute a lot to water pollution.
Water purification involves manual treatment using chemicals and complex filtration systems that are disinfected, ion-exchanged, and distilled.
However, the filtering process can also be done using a lot of natural processing.
UV treatment provides natural biological filters for water.
Additional manual exposure to ultraviolet rays results in a purification method for purifying water.
The Environmental Protection Agency reports that UV-treated water can prevent "cryptospores", a "tiny parasite that lives in the intestines of infected animals and humans ".
The advantage of this filtering method is the low cost.
The natural sediment is deposited under the action of gravity.
Heavier substances settle in the water to the bottom, while lighter deposits float at a higher level in the fluid.
EPA's report, water on the tap: What you need to know, states that in a process called coagulation filtration, precipitation filtration is often used with the woks.
The first step is to remove larger particles by adding iron salt and alum or synthetic organic polymers that bind together to form the woks.
Once the flotilla attracts a large amount of dirt elements to combine with the material, water is allowed to stagnate during precipitation.
The advantages of precipitation filtration include low cost.
The use of sand to filter water provides the option of slow or pressure handling.
Slow handling passes water through the sand at about 2 liters per minute.
Pressurized sand filters water through the same amount of sand at a speed of 40 liters per minute.
Sand provides a cheap filter, but has little effect on removing bacteria from the water.
The National Drinking Water Information Center profile "technical profile: slow sand filtration" states that sand filters require a large number of sites to be processed, "a large number of filter media and clean labor.
"In order to keep the sand pure, it must also be cleaned regularly.
It turns out that this filtering method is a "simple and reliable process ".
Oxygen oxidation injects air into water to filter impurities.
The ventilation captures the water from the pond and transfers it to the nozzle to spray the water into the air.
Over time, large ventilation pools filter water, which is an expensive process that can reduce odor and dissolve pollution in the form of gas.
An advantage of this process, EPA says, is "to remove contaminants that are prone to become gases, such as gasoline composition and radon.
"The disadvantage of this water treatment technology is the amount of pollutants coming into the water from the air around the oxidation pool.
EPA notes that this process is often combined with other filtration systems to remove contaminants that are not affected by ventilation.