How filtration works

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How does my filter work?

Its simple really – water is just Hydrogen and Oxygen.  Anything else is a contaminant and, whether its physical (such a dirt or grit or rust particles) or chemical (such as chlorine molecules) its suspended in the pure water.

These contaminants are measured in microns and a micron is 1 millionth of a metre or 0.000039 of an inch. To give you an example, human hair is around 100 microns.

Filters are rated to various micron levels, obviously the smaller the micron level the smaller the particle or molecule they will remove from your water.

Our typical undersink domestic water filtration system contains 2 filter cartridges.  The first is rated to 5 microns and this will remove dirt, grit and sediment from your water.

The second (and this is probably the most important one) is rated a 0.5 micron and is designed to remove chlorine and any other taste and odour causing chemicals and bacteria such as giardia and cryptosporidium.

It is very important to note that no normally available filter cartridge will remove viruses from water because it would need to be smaller than 0.01 microns and, at that level of filtration, the water would not flow through efficiently.

The only way to effective remove viruses is to install a Reverse Osmosis system which, while considerably more expensive, is the alternative if viruses are a danger.

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