Carbon filters are one of the most common types of water filters. They are often used in home water filtration systems and can be found in many different water purifiers. Carbon filters work by absorbing impurities onto the surface of the carbon particles. This process removes many contaminants, including chlorine, bacteria, and chemicals.

Water purifiers are an essential part of keeping your family healthy and hydrated. But with so many different types and brands on the market, it can be hard to know which one is right for you. If you’re looking for a water purifier that can remove impurities and contaminants from your water, you should consider a 7-stage RO system. Carbon filters are one of these stages. 

Carbon Filter

A carbon filter is a type of water filter that uses activated carbon to remove impurities from water. Activated carbon is a porous material that absorbs (binds to) specific contaminants, preventing them from entering your water supply. Carbon filters effectively remove chlorine, harmful gases, pesticides, and other harmful impurities from your water. 

They are also good at reducing bad taste and odors in your water. If you’re concerned about tap water quality, then a RO system may be the right choice. Be sure to choose a reputable brand and follow the manufacturer’s instructions for proper installation and maintenance.

Features of a Good Carbon Filter

  • Pore sizes ranging from 1 micron to 5 microns
  • The iodine number is 800 or above 
  • Prepared by coconut shell carbons 
  • 10″ is the universal size 

Three Most Popular RO Carbon Filter

Is Carbon-Filtered Water Good for You?

There are a few schools of thought regarding carbon-filtered water. Some people believe that carbon-filtered water is essential to maintain good health, while others believe it does not make a significant difference. Here, we will look at both sides of the argument to help you make an informed decision about whether carbon-filtered water suits you.

Those who believe that carbon-filtered water is good for you typically point to the fact that it can remove impurities from your water supply that could potentially be harmful. Carbon filters are designed to remove contaminants such as chlorine, lead, and other heavy metals from your water, improving its taste and smell while making it safer to drink. Additionally, carbon-filtered water can help to reduce your risk of certain diseases and health conditions by removing bacteria and other dangerous microorganisms from your drinking supply.

On the other hand, some argue that carbon-filtered water is not necessary to maintain good health. These individuals typically point out that most municipal water supplies in developed countries are already treated with chemicals like chlorine to kill off harmful bacteria or microorganisms, making additional filtering unnecessary. Furthermore, they argue that the small amount of impurities removed by a carbon filter is unlikely to impact your health significantly. 

But we all know that water can be contaminated easily from sewage lines. So proper treatment for household water is a must. As a result, you must need a water purifier, especially a RO system, including a carbon filter. 

Does Carbon Filter Reduce TDS?

Carbon filters can reduce Total Dissolved Solids (TDS) by a minimal amount of 2% to 5%. TDS measures the combined content of all inorganic and organic substances in water. While carbon filters are not designed to remove TDS from water, they can help reduce specific contaminants that contribute to TDS. 

One common contaminant that contributes to TDS is chlorine. Chlorine is added to municipal water supplies as a disinfectant, but it can also cause an unpleasant taste and odor in water. Carbon filters are effective at removing chlorine from water, which can help to improve its taste and smell. 

In addition, carbon filters can also remove other contaminants that contribute to TDS, such as lead and mercury. While carbon filters will not altogether remove all traces of contaminants from your water, they can help reduce certain pollutants that contribute to TDS. If you’re concerned about the quality of your drinking water, using a carbon filter is one way to help ensure that it meets your standards for safety and taste.

Do Carbon Filters Purify Water?

Yes, carbon filters purify water but for specific contaminants only. Carbon filters work by absorbing (attaching) impurities to the surface of the filter material. As water passes through the carbon filter, contaminants are trapped on the filter surface and removed from the water. Carbon filters can remove many impurities, including chlorine, taste and odor compounds, organic chemicals, and some heavy metals. 

Carbon filters effectively remove many contaminants from water, including chlorine, VOCs (volatile organic compounds), THMs (trihalomethanes), lead, and mercury. They are also effective at removing bad taste and odors from water. Carbon filters can purify municipal tap water and private well water.

It is possible to customize carbon filters to target specific contaminants.

For example, if you are concerned about lead in your drinking water, you could use a carbon filter with a small pore size designed to remove lead. 

Similarly, suppose you want to remove chlorine from your shower water, not other impurities like minerals or dissolved solids. In that case, you could use a showerhead filter with an activated carbon block cartridge. Another advantage of carbon filters is that they do not produce harmful byproducts like some other types of water treatment systems (such as chlorination).

Carbon Filter vs Sediment Filter 

The choice of a water purifier carbon filter should be based on the home’s specific needs. A sediment filter removes pollutants, including bacteria, viruses, and other harmful particles, while a carbon filter traps toxins and harmful chemicals. The two filters are important because they affect the quality of water circulated through the home.

A study published in “Environmental Science and Technology” found that both filters effectively remove lead and other heavy metals from water. However, the carbon filter traps bacteria and other pollutants more effectively. A sediment filter can also trap pollutants such as sediment, which can cause problems for your home’s plumbing system.

The following list will clear out what specific differences between carbon filters and sediment filters. 

Types of Carbon Filter In Water Purifiers

There are many types of carbon filters available in the market. But the most effective and popular is coconut shell granular activated carbon. 

Granular activated carbon

Granular activated carbon (GAC) filters

The most common type is the GAC filter, a granular activated carbon filter, or a charcoal filter. It works by adsorbing impurities and other contaminants in the water. The main advantage of this filter is that it can remove almost all kinds of organic compounds from water. However, it has a disadvantage that it does not work well with chlorine.

Carbon Block

Carbon Block Filter

A carbon block filter is similar to a GAC filter but uses a solid piece of carbon instead of granules. This filter is used when you want to remove only specific chemicals like heavy metals, pesticides, etc. It is very effective against bacteria and viruses.

Catalytic Carbon

Catalytic Carbon

This is an advanced form of carbon filter. It consists of a porous material coated with catalysts. When water passes through this filter, the catalyst converts harmful substances into harmless ones.

Impregnated Carbon

Impregnated Carbon (Ion Exchange Resin)

It is made up of resin particles filled with ion exchange materials. Ion exchange resins are widely used to treat wastewater because they can remove ions such as calcium, magnesium, iron, manganese, zinc, copper, lead, arsenic, mercury, cadmium, chromium, nickel, and selenium.


It combines two different filtration media: fibers and granular activated carbon. It removes both suspended solids and dissolved organics.

Coconut Shell – Granular Activated Carbon (The Best Types) 

Coconut Shell – Granular Activated Carbon filters are considered the best carbon filters for their absorbance and quality. Preparing activated carbon involves heating coconut shells or coal without oxygen.

The coconut shell granular activated carbon filter comprises coconut shells that have been ground into small pieces and mixed with activated carbon. This mixture is then pressed into a solid cake and dried. Coconut shell granular activated carbon filters remove chlorine, heavy metals, pesticides, herbicides, volatile organic compounds, and other toxic chemicals from tap water. They also help reduce odor and taste. 

The most common type of activated carbon used in carbon filters is granular activated carbon (GAC). GAC is made from coconut shells or coal treated with oxygen to create a porous structure. This porous structure gives GAC a large surface area that can adsorb contaminants from water.

When water passes through a GAC filter, contaminants are attracted to the surface of the GAC and are trapped on it. The longer water stays in contact with the GAC, and GAC filters will remove more contaminants. As contaminated water flows through the GAC filter, it becomes less contaminated and purer.

How Activated Carbon Filter Works

An activated carbon filter is a device used to remove impurities from water by adsorption. Adsorption is a process where contaminants are drawn to the surface of the carbon filter media like a magnet. The most common use for an activated carbon filter is in drinking water purification systems.

Granular Activated Carbon (GAC) filters are made up of thousands of tiny pores that can adsorb and trap contaminants as small as 0.5 microns in size, making them very effective at removing dissolved organic matter (DOM), chlorine, chloramines, pesticides, herbicides, VOCs, THMs and other chemicals from water. Activated carbon filters can be used in point-of-use (POU) and point-of-entry (POE) water filtration systems. POU systems are installed on the water line from your home or office, while POE systems are installed on the main water line from your building.

The working principle behind an activated carbon filter is simple – contaminated water passes through the pores of the carbon block, where impurities are adsorbed onto the surface of the carbon granules. As more water flows through the filter media, it becomes increasingly influential in trapping contaminants.

What is the Scale of Measuring the best Carbon Filters? 

The iodine number is a measure of the effectiveness of activated carbon. The iodine number of carbon is the number of milligrams of iodine that can be absorbed by 1 gram of carbon. Iodine numbers describe purity, absorption capacity, effective range, fineness of pores, etc.

The market offers granular activated carbon (GAC) with different iodine numbers. Various iodine concentrations are available, including iodine 300, iodine 800, iodine 1100, and iodine 1200. The highest quality activated carbon is Iodine – 1100 and Iodine – 1200

When to change carbon filters in the water purifier? 

Ideally, it would be best if you replaced carbon filters every 6 months to a year. Your tap water quality is the primary determinant of changing carbon filters. Good quality tap water extends the life of carbon filters. The lifespan of carbon filters varies due to water quality and the absorbant of chlorine from water. 


A carbon filter is a type of physical filter that removes impurities from water by adsorption onto the surface of activated carbon. Carbon filters are used in various water purification systems, including pitcher filters, faucet-mounted filters, refrigerator filters, and whole-house filtration systems. Carbon filters work by adsorbing contaminants onto the surface of the activated carbon.