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The Different Types of Water Filtration Systems

Updated on October 29, 2012
All domestic water purifiers fall into two classifications; point of entry purifiers and point of use purifiers.
All domestic water purifiers fall into two classifications; point of entry purifiers and point of use purifiers.

Fundamental Types of Water Purifiers

There are two basic types of water filtration systems in the market today; Point of Entry Filtration Systems and Point of Use Filtration systems. A Point of Entry water purifier is a system that cleans the water entering the house. A point of entry system is also a whole house water purifier. A point of entry system is the first line of defense against sediment, chemicals, and cysts in the water.

A point of use system describes a whole slew of filtration systems that further filter the water, usually for drinking purposes only. These systems are typically countertop or undercounter systems and do many different things with the water depending on the goal of filtration. Point of use systems account for the majority of water purifiers on the market. They are easier to sell in part because they do not require filtration and because most homes already have point of entry water systems built into them.

Types of Point of Entry Filtration Systems

Point of Entry Filtration Systems are largely sediment filters. They typically hook into the cold water line that feeds water into all parts of the the house. In some cases, they may also be able to remove chlorine and cysts, but their first and primary function is to remove sediment from the water. Point of Entry systems do not have a lot of variation in terms of basic fundamental functions. There are, however, many different models available for use on the market.

Types of Point of Use Water Purifiers

The basic types of point of use systems include: Reverse Osmosis Water Purifiers, Carbon Block Filters, chlorine removal filters, UV and Ozone Purification systems, Refined sediment filters, antibacterial filters, and water ionizers.

Reverse Osmosis Water Purifiers: These systems put the water through an extensive process that essentially distills the water by removing all minerals from it. The process loses a lot of water during purification and is often considered wasteful. There are also concerns that distilled water is unnatural and unhealthy. See our hub on the qualities of good water.

Carbon Block Filters: Carbon block filters are designed to remove particles and chlorine from the water; particularly chlorine. They also have the ability to remove some other gases from the water too.

UV and Ozone Purification Systems: These systems combine UV light and ozone to kill bacteria in the water and oxidize gases in the water. Ozone has been used in water purification for over 200 years.

Refined Sediment Filters: As a point of use system, this filter is designed to provide a greater level of particle filtration. These filters are often combined with carbon filtration.

Antibacterial Filters: These filters remove bacteria and other germs from the water.

Water Ionizers: These water purifiers alter the PH and antioxidant value of the water by introducing negatively charged hydrogen into the water. These systems also micro cluster the water at the molecular level for faster cellular penetration which speeds up your hydration process when drinking this water.

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