10 Types of Water Filters: Find the Clear Choice for Your Home

There are 10 main types of water filters: mechanical, activated carbon, reverse osmosis, ion exchange, ultraviolet, ceramic, distillation, infrared, activated alumina, and microfiltration. If you’re looking to bring cleaner, fresher-tasting water into your home, a water filtration system is a good investment. However, with so many different types of water filters available, understanding your options can get a bit overwhelming. Read on to explore the basics of today’s most common water filters, including how each type works and its pros and cons.

1. Mechanical Filters 

A mechanical water filtration system uses a mesh barrier, screen, or porous material to prevent contaminants—like sediment, dirt, and rust—from entering your water supply. They have a micron rating that reflects how effective the filter is. Lower ratings equate to better particle-blocking capabilities.

Best for: Filtering out visible debris and sediment

2. Activated Carbon Filters 

These water filters have a bed of activated carbon that traps chlorine and volatile organic compounds (VOCs). They can also remove some pesticides and heavy metals (including lead), but they don’t work on minerals, microbes, or salt. Like mechanical filters, activated carbon filters often serve as one of the first stages in multi-stage water filtration systems.

Best for: Eliminating VOCs, chlorine, certain heavy metals, and pesticides

3. Reverse Osmosis 

Reverse osmosis (RO) filters force water through a semipermeable membrane under high pressure. This process removes contaminants and impurities as small as an ion, including chemicals, microorganisms, dissolved salts, and heavy metals.

Best for: Producing ultra-clean drinking water that’s free from nearly all contaminants

4. Ion Exchange Filters 

Ion exchange filters swap hard water ions (such as calcium and magnesium) for softer ones (like sodium and hydrogen). They effectively serve as a water softener, which makes them suitable for areas with hard water. However, they can’t remove many types of contaminants, including bacteria, viruses, and VOCs.

Best for: Minimizing scale buildup and softening hard water

5. Ultraviolet Filters

When water passes through an ultraviolet (UV) filter, it’s sanitized by a UV light. This light damages the DNA of any microorganisms in the water, including bacteria and viruses, which disrupts their ability to reproduce and harm your health. UV filters are excellent for disinfection, but they’re most effective when paired with filters that can block other contaminants.

Best for: Eliminating bacteria and viruses

6. Ceramic Filters

Ceramic is a porous material, so when it’s used as a water filter, it can trap bacteria, parasites, and other contaminants. These cost-effective filters can be found in areas where waterborne diseases—like E. coli and salmonella—are a concern. However, their filtration capability is somewhat limited, so it’s best to use them in conjunction with other filters.

Best for: Filtering out bacteria and sediment in places with limited clean water

7. Distillation 

Distillation is a water purification system that involves capturing the steam from boiling water, then letting it cool and condense back into a liquid. As the vapor cools, it leaves behind many impurities and contaminants, including minerals, heavy metals, bacteria, and viruses. The result is a highly purified form of water, which is often used in laboratory and medical settings.

Best for: Situations where ultra-pure water is necessary, like medical work

8. Infrared Filters 

This type of water filter system uses infrared light to change the physical qualities of water, decreasing the size of the water molecules so that they’re more easily absorbed by the body. This process softens the water but doesn’t remove contaminants, so infrared filters should be integrated with other types for maximum filtration.

Best for: Pairing with other types of filters

9. Activated Alumina Filters

As water moves through an activated alumina filter, certain contaminants—including arsenic, fluoride, and selenium—attach themselves to the alumina (aluminum oxide). It works much like an activated carbon filter, except it removes different contaminants. Before installing one of these filters, make sure you know how to dispose of them responsibly without harming the environment. If you have questions, contact a local water softener installation company.

Best for: Regions where fluoride, arsenic, and selenium levels are particularly high

10. Microfiltration

In a microfiltration system, water flows through a porous membrane, which captures large particles and certain microorganisms, including bacteria and some viruses. While they are energy-efficient and chemical-free, microfilters aren’t effective at removing chemicals or dissolved contaminants.

Best for: Filtering out bigger particles, bacteria, and certain viruses