Common Types of Water Filters and How They Work

The many different water contaminants range from arsenic and fluoride to heavy metals and pathogenic bacteria. Factors like plumbing, water runoff and the age of your home may mean that you’re dealing with a particular water contaminant—but your neighbor may be dealing with a completely different type. Here are six of the most common water contaminants that home water filters target: 

• Bacteria: Not all types of bacteria are harmful, but pathogenic bacteria can make you sick. Harmful bacteria can enter your water supply from runoff, a fractured well casing or broken lines.
• Chlorine: Chlorine is often used in municipal water treatment to disinfect the supply. Leftover chlorine compounds coming from your tap may have an unpleasant taste or smell and can cause dry, itchy skin.
• Copper: Copper is an essential element found in rock, soil and water. Corrosion of copper pipes in your home can boost the concentration of this element in your water. Drinking water that contains high levels of copper can cause gastrointestinal issues.
• Fluoride: Fluoride is added to most public water supplies to reduce tooth decay throughout the community. But too much exposure to the natural mineral at a young age might increase risk of a cosmetic condition that causes dark streaks or spots on teeth.
• Iron: High levels of naturally occurring iron in your water produces a metallic taste and smell. It can stain your toilet, sink, bathtub and even the dishes and clothing you wash in the water.
• Lead: Lead usually gets into a water supply by leaching from lead service lines or other parts of the plumbing system, such as the lead solder for joining copper pipes or even brass- and chrome-plated faucets f. Young children and pregnant women are particularly vulnerable to adverse health effects from lead.

Tip: To find the best water filter to remove potentially harmful contaminants from your home, use a water test kit. Then, purchase a water filtration system that’s made to target the contaminants you’re dealing with.

When determining which filter is best for your home and family, it’s helpful to know how each type works. Different types of water filters use different methods to remove or destroy contaminants:

• Ultraviolet light: Water is exposed to ultraviolet radiation from UV filters, which destroy various bacteria that could be potentially dangerous to your health. UV filters work without additional heat or chemicals.
• Carbon block and activated carbon: A carbon block water filter removes larger particles from water by attracting and absorbing sediment or silt. A carbon water filter is used in many types of filters, including faucet water filters.
• Sand and sediment mesh: Mesh filters remove dirt, clay, sand and rust particles before they reach the rest of your plumbing system, including expensive appliances and your faucet.
• Reverse osmosis: A reverse osmosis water filter forces water through a semi-permeable membrane. This removes contaminants and impurities from drinking water.
• Infrared: Infrared technology uses heat and light to negatively charge hard water. As with alkaline filters, the water treated with an infrared filter has a softer feel, similar to water that passes through a water softener.
• Alkaline and water ionizers: Water passes over electrically charged plates, separating the alkaline water from the acidic water. The result is softer water that’s more suitable for drinking—and better for your skin when bathing.

Tip: When installing and using a water filter, read the manufacturer’s label carefully to determine what contaminants are removed from the water filtration system. Not every method of filtration will remove all contaminants to purify water.