In order for any water purification device to be called a water filter, it needs to have some sort of barrier. These filters use their barriers to remove contaminants from the water. Not all sources of water contain the same contaminants. Not every filter has the same type of barrier.

Some water filters have a physical barrier, a layer of fine pores. The impure water looses its impurities as it filters through those pores. Sometimes, the cleaning of water requires more than just one simple filter. Sometimes, it calls for the additional use of a filter with either a chemical or a biological barrier.

A good filter leaves important minerals in the water. Minerals add to the benefits derived from drinking clean water. Minerals can also add to the nutritional value of produce, whenever a filtering device is used to clean the water in an irrigation system.

Calcium, potassium and magnesium are minerals found in most natural water. A healthy body can fight-off disease much better, when that body is revitalized with water that contains the above-named minerals. There are several types of filters that guarantee retention of revitalizing minerals.

When a filtration system needs to remove sand and other impurities, it often contains a screen filter. When a filtration system must remove organic matter from water, then that system should have a media filter. A filtration system that purifies urban water normally has rapid sand filters.

Urban dwellers need to realize that the water coming from a rapid sand filter can not be considered "fit to drink." That water must be treated further, if it is going to enter the body of those who will be filling a drinking glass with such filtered water.

The residents of Bangladesh discovered that cloth makes a good filter. Those residents folded a sari a number of times, and then passed water through the many resulting layers of cloth. By using those cloth filters, the residents of Bangladesh reduced the number of pathogens in their water.

A water filter that is designed to transform raw water into potable water typically contains slow sand filter beds. Some contain a cartridge. The discs in that cartridge filter out a large percentage of the impurities in the water.

Regardless of the type of water filter in a filtration system, the filter of interest removes from the water particles that are much smaller than the hole through which the water passes. Aquarium owners rely on the purity of water coming from theirs. Pool owners look forward to a pleasant summer by the pool, because they trust the reliability of good filters.

Both aquarium owners and pool owners know that a good water filter delivers clean, pure water. Homeowners know that a reliable filter puts great-tasting water in each glass that is filled at the appropriate water tap. What is the nature of that filter?

In most cases, it is a filter that contains carbon filters with ion exchange and micron filtration. When gardeners, aquarium owners, pool owners or homeowners choose to use such a filter, then they can know that water from that filter offers proof that the purchaser of that filter has chosen the safest type of water filter.

Discover why everyone needs water filters in and out of the home.

Laurel Tevolitz is a dedicated researcher of critical issues that affect health and well-being. Visit her water purification blog now at to discover which water purification system she recommends after extensive research.

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