Microporous Filtration

MICROPOROUS FILTRATION or submicron filtration uses a membrane or hollow fiber with an absolute pore size of 0.2 micron that prevents any contaminant larger than 0.2 micron from passing through it. The submicron filters retain carbon fines from the carbon cartridge, resin fragments from the deionization cartridges and any bacteria that may have entered the system.

NCCLS considers water to be particulate free when it has been passed through a 0.2 micron filter. Microporous membranes are generally considered to be indispensable elements of a water purification system, unless they are replaced by an ultrafilter.