How to Filter Chlorine out of Water

Removing chlorine from water is essential for those who want to enjoy clean, crisp-tasting water without the undesirable effects of this chemical. In this article, we will explore various methods for filtering chlorine out of water, discussing their effectiveness and ease of use.

Why Remove Chlorine?

Chlorine is a common disinfectant used by water treatment plants to kill bacteria and other harmful organisms. However, there are some downsides to its presence in drinking water:

Activated Carbon Filters

Activated carbon filters are one of the most popular and effective methods to remove chlorine from water.

  • Function: These filters use a process called adsorption, where chlorine molecules are attracted to and held by the surface of the activated carbon.
  • Types: Available as faucet-mounted, under-sink, or whole-house systems.
  • Effectiveness: Can remove up to 99% of chlorine.

Reverse Osmosis Systems

Reverse osmosis (RO) systems offer another reliable way to filter out chlorine.

  • Function: These systems force water through a semi-permeable membrane, trapping contaminants like chlorine.
  • Types: Primarily available as under-sink systems.
  • Effectiveness: Can remove up to 98% of chlorine.

Dechlorination Tablets

Dechlorination tablets are a convenient and portable option for filtering chlorine.

  • Function: These tablets release a compound that neutralizes chlorine in the water.
  • Types: Available in tablet or powder form.
  • Effectiveness: Can remove up to 99% of chlorine.
  • Use case: Ideal for campers, travelers, or emergencies.

Related: How to Remove Tannins from Water: Expert Techniques and Tips

Boiling Water

Boiling water can be an effective, though time-consuming, method for removing chlorine.

  • Function: The heat causes chlorine to evaporate from the water.
  • Effectiveness: Can remove up to 95% of chlorine.
  • Drawbacks: Not practical for large volumes of water or continuous use.

Here are some additional sections that could be added to the article to provide more comprehensive information:

Ultraviolet (UV) Disinfection Systems

  • Function: UV light can break down chlorine in water.
  • Types: Available as stand-alone systems or as part of a multi-stage water filtration system.
  • Effectiveness: Can remove up to 99% of chlorine.
  • Additional benefits: UV disinfection systems can also kill bacteria, viruses, and other harmful microorganisms in the water.


  • Function: Distillation involves boiling water and collecting the condensed vapor, leaving behind contaminants like chlorine.
  • Types: Available as countertop or whole-house systems.
  • Effectiveness: Can remove up to 99% of chlorine.
  • Additional benefits: Distillation can also remove other contaminants, such as heavy metals and minerals.

Maintenance and Replacement

  • Importance: Regular maintenance and filter replacement are essential for maintaining the effectiveness of any water filtration system.
  • Tips: Include information on how often filters should be replaced, signs that a filter may need replacement, and steps to perform maintenance on various types of filtration systems.

DIY Solutions


For those seeking cost-effective or temporary solutions, there are several DIY methods for removing chlorine from water:

  • Pitcher with built-in filter: Some water filter pitchers are designed to remove chlorine and other contaminants. These are convenient and affordable, making them a popular choice for improving water taste and odor.
  • Homemade activated carbon filter: You can create a simple activated carbon filter using a container, activated carbon granules, and a porous cloth or mesh material. Fill the container with activated carbon and cover it with the cloth or mesh, then pour water through the filter to remove chlorine. Note that this method may not be as effective as a professionally designed filter, and the activated carbon will need to be replaced periodically.
  • Natural dechlorinating agents: Vitamin C, or ascorbic acid, is a natural and environmentally friendly option for neutralizing chlorine in water. You can use vitamin C tablets or powder to dechlorinate water effectively. Keep in mind that this method may not remove other contaminants present in the water.

While these DIY solutions may not be as effective as professionally installed systems, they can still provide noticeable improvements in water quality by reducing chlorine levels.

Comparison Table

MethodTimeCostEffectivenessInstallation & MaintenanceAdditional Benefits
Activated CarbonImmediateLow to ModerateUp to 99%EasyRemoves other contaminants, improves taste
Reverse OsmosisImmediateModerate to HighUp to 98%ModerateRemoves other contaminants, improves taste
Dechlorination TabletsWithin minutesLowUp to 99%N/A (Portable)Convenient, portable, emergency use
Boiling Water5-10 minutesLowUp to 95%N/A (DIY)No installation required
UV DisinfectionImmediateModerate to HighUp to 99%ModerateKills microorganisms, improves water safety
Distillation1-4 hoursModerate to HighUp to 99%ModerateRemoves heavy metals and minerals

This table compares the various methods for removing chlorine from water, taking into account factors such as time, cost, effectiveness, installation and maintenance requirements, and additional benefits. Note that the values provided are general estimates and may vary depending on specific products or situations.


Several methods can effectively filter chlorine out of water, including activated carbon filters, reverse osmosis systems, dechlorination tablets, and boiling water. The best method for you will depend on your specific needs, budget, and preferences. By choosing the right solution, you can enjoy clean, great-tasting water without the drawbacks of chlorine.

Frequently Asked Questions (FAQ)

Q1: Is chlorine in drinking water harmful?

While chlorine is effective at disinfecting water and making it safe to drink, some people may experience side effects from ingesting chlorinated water, such as skin and eye irritation or respiratory issues. Additionally, chlorine may react with other compounds in the water to form disinfection byproducts (DBPs), some of which may pose health risks.

Q2: Can a Brita filter remove chlorine?

Yes, Brita filters use activated carbon to remove chlorine from water. They can effectively reduce the taste and odor associated with chlorine, but may not remove it as completely as other methods like reverse osmosis or UV disinfection.

Q3: How long does it take for chlorine to evaporate from tap water?

The time it takes for chlorine to evaporate from tap water depends on factors like water temperature and surface area. As a general rule, it can take between 24 to 48 hours for chlorine to evaporate from a container of tap water left open to the air.

Q4: Is boiling water an effective way to remove chlorine?

Boiling water is a simple and effective way to remove chlorine, as the heat causes it to evaporate. However, boiling may not be practical for large volumes of water or continuous use, and it does not remove other contaminants like heavy metals or minerals.

Q5: How often should I replace the filters in my water filtration system?

The frequency of filter replacement depends on the type of filtration system and the quality of the source water. Generally, activated carbon filters should be replaced every 3 to 6 months, while reverse osmosis filters may need replacement every 6 to 12 months. Always refer to the manufacturer’s guidelines for specific recommendations.

Q6: Can I use vitamin C to neutralize chlorine in water?

Yes, vitamin C can effectively neutralize chlorine in water. Ascorbic acid, the chemical name for vitamin C, reacts with chlorine to form harmless compounds. You can use vitamin C tablets or powder to dechlorinate water, making it a natural and environmentally friendly option.