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Ultimate Guide On How Do Water Filters Work

When you look at water in a bottle or glass, you will see they are clear. You may think it is safe for drinking. In America the case is usual.

However, the cleanest water may contain particles that are not visible to naked eyes. Some small types of minerals the in the water. They affect the taste of the water.

At the same time, the minerals are very harmful. In the developing countries, the A water sources of water like rivers’ water are compacted with protozoa, bacteria, and some other parasites.

They may make you ill or sometimes may kill you. Over 780 million people in the whole world are fighting with this problem. So you may read the article on how do water filters work to save you from this problem.

Thanks, the water filter is made to keep yourself and your body away from the nasty buggers from the water. But now the question how accurately a filter can change a potential poison into the necessary level to survive?

The idea beyond the device is very simple. Grip all the undesirables and pass water through it. It may be completed with a microscopic holes or pores. The size of the pores is less than 1/1000th of a millimeter. Pass molecules of water through it. They are very small for viruses and bacteria.

The concept of the design is very simple. Store all the undesired water and let clean water through.

Municipal Treatment

In the filtration system, lots of materials are used. It depends on the water or where it is being filtered. In the municipal treatment, water passes through a screen or other polymers to take out particles like leaves, sticks or debris.

Then it goes through a series of filters made of sands. Sometimes it passes through biological filters like algae.

how do water filters work

The purpose is to remove protozoa or dangerous bacteria. And finally add some powder or liquid, bubbling in ozone gas, goes through ultraviolet light. They can remove harmful pathogens from water. In this stage, water becomes free from dangerous contaminants and large particles before reaching at home for use.

From Treatment Plant to Home

At the time of making the journey of water from the municipal plant to the homes, the ageing infrastructure can affect the water at your home. Ageing wastewater system may leak untreated sewage to the surface water.

The old pipes of the system can enter lead, and some other heavy metals in the way of water. So the residential water filters play a very significant role.

Home Filters

Most of the water filters that the customers use are made from the activated carbon. The carbon is very popular as a small amount has a large surface area. One gram of activated carbon has the surface area of 4 tennis courts.

The area is very big meaning that it can hold great numbers of pollutants or organic compact. In PUR water filter there is coconut shell activated carbon as the pores are very small than the other carbon filters.

how do water filters work

So the PUR can remove chlorine, chemicals and pharmaceuticals and heavy metals like mercury and lead. It can remove organic compounds which affect the taste and smell of water.

It removes mineral ions like magnesium, calcium, fluoride that are good for the body and develops the taste of water.

The water filter is the only thing that will ensure you that your water is safe and good tasting. There are many options in the market. Such as a faucet filters water directly from the tap.

A pitcher that is posted on the countertop or the refrigerator. If you go for camping or hiking, you must need safe drinking water, needless to say.

The water filter is the most desired way to ensure drinking water or great tasting water. The price of the product is affordable and comes with varieties of factors.

The water filter has a great value than the bottled water. What the water comes from the tap is very tasty or better than the bottled water.

In bottle water, a lot of plastics are used. To produce plastic bottle about 1, 00,000 cars are running with the great amount of oil.

The basics of common water filter technologies

how do water filters work

Carbon/Activated Carbon

The activated carbons have the power to remove the contaminant from water. The filters are very effective. Some filters remove chlorine and upgrade the taste and the odor.

There are some other that removes a large number of contaminants like lead, mercury, volatile, asbestos, and organic compounds (VOCs).

At last, the activated carbon cannot remove pollutants like fluoride, arsenic, nitrate, hexavalent chromium and perchlorate. There are two types of carbon filters like granulated activated carbon and carbon block.

Carbon Block

There is more pulverized activated carbon in the Carbon block filters. It is shaped into the block with high pressure. They are more effective than the granulated activated carbons filters as it contains more area. If they quickly flow water, they are more effective.

Granulated Activated Carbon

There are grains of activated carbon in these filters. The carbon block is not more effective than the filters as it has smaller activated carbon surface. The effectiveness also depends on the flow of the water.


The ceramic filter has a tiny hole on which it holds contaminants like cysts and sediments. They are failed to remove the chemical contaminant.


how do water filters work

The filter applies an ion exchange method to remove mineral salts, and some other electrically charged molecules from water. The method fails to remove nonionic contaminants like trihalomethanes or microorganisms. EWG’s filter guide will not include filters based rely on the technology.

Distillation: The system raises

The system raises the temperature high to the vaporize level and the steam back to the water. It can remove many bacteria, minerals, viruses and chemicals that have a high boiling point. WEG’s never uses such type of filter relied on this technology.

Fibredyne block

It is the proprietary type of carbon block filter which demands to contain higher sediment catching capacity than the other carbon block filters.

Ion Exchange

The technology applies a resin to pass water that replaces unexpected ions with others which are more desirable. Water softener replenishes magnesium and calcium with sodium. The resin must change periodically with replacement ions.

Mechanical Filters

Mechanical filters are riddled with tiny holes which remove contaminants like sediments and cysts. They are being used in conjunction with other technologies, but sometimes used alone. They fail to remove chemical contaminants.


Ozone has the power to destroy bacteria and the other microorganism. Sometimes it is used with filtering technologies. The system is not effective enough to kill chemical contaminants. EWG’ does not use such filter relied on this technology.

Reverse Osmosis

how do water filters work

In this method, water goes through a small permeable membrane which removes particles bigger than water molecules.

The RO removes many particles, but it fails to remove activated carbon, having fluoride, arsenic, nitrates, hexavalent chromium. Moreover, RO fails to remove trihalomethanes, chlorine, or volatile organic chemicals.

There are lots of Osmosis system which has activated carbons. But they cannot remove other contaminants. The quality depends on the carbon filters and the membrane system.

Customers need to know that RO filters use 3 to 20 times more water. They only waste water. Besides they are best for cooking and drinking only.

UV (ultraviolet)

The system sometimes uses ultraviolet rays to destroy bacteria or some other microorganism. The do not remove chemical contaminants. EWG’s does not offer such kind of filter based technology.

Water Softeners

The technique is used to in an ion exchange system to lessen the level of magnesium, calcium, barium and few forms of radium. They fail to remove other contaminants.

As water softener replaces magnesium and calcium with sodium. The treated water contains high sodium content.

Doctors advise some patient not to take softened water. As it is similar to use water in gardening or watering plants.

Watch: How do water filters work


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