Water Filters

Water filters are a very common method to clean and purify water, both in terms of household systems and also industrial / municipal systems. The main purpose of a water filter is to clean water by removing various pollutants, particles, impurities, molecules etc. from it – the level if filtration is determined according to the structure of the water filters, the density of it, the technological or physical process by which it operates and a variety of other factors.

Water filters clean and purify water using some sort of physical barrier, a biological process or a chemical process – advanced filtaration systems use a few methods as a complete process to deliver water in high levels of purification. The extent of purification needed by water filters is according to the required use of the water – drinking water, irrigation, industrial needs, aquariums, swimming pools etc.

An important point regarding water filters is that due to the various methods some filters can remove particles that are in fact smaller than the actual holes that the water passes through. Another thing is that water filters are not always part of a water purification system, sometimes a water filter will only remove large particles such as dirt and rust from the water and sometimes a filter will be part of a complex system that purifies the water.

Regular and complex water filters

Household water purification and cleaning systems can be divided to regular filtration systems and complex systems. These to main catgories can be divided to normal water filtration systems using various water filters, reverse osmosis systems and countertop “mini-bar” systems.

Common water filters

Water filters can be placed individually inside the water system but normally they are part of a filtration system that contains 2-4 water filters. The most common types of filters used in household systems are:

  • Mechanical filter: the most simple type of water filter and the cheapest one, filters pollutants with large particles like sand, dirt, rust etc.
  • Activated carbon filter: this is a more advanced water filter that has the ability to absorb chemicals and neutralize tastes and odors. These water filters are divided into two layers, a “block” filter that has pores of 0.5-10 micron and a dense carbon filter that doesn’t filter particles but is important for the process. Activated carbon water filters can become a bacteria colony if they are not changed when needed – This can be prolonged if the water filters are treated with silver ions for example that are good antibacterial agents.
  • Bacterial biological filter: A lot of water purification systems use an ultra violet (UV) light that destroys bacteria. A bacterial water filter can also use UV light but also incorporate other biological processes that eliminate bacteria. Water filters using biological methods are generally more expensive.

Water filters tips

One needs to choose water filters and water purification systems according to the problems or concerns with the water, as there might not be a need to use all the filters available.

The price of water filters systems needs to include the installation and replacement filters.

It is normally advised to work with water filters and systems from certified and well known suppliers rather then “miracle” working proposals.

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