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__NOTOC__
[[Image:CAWST_BiosandFilterpen NORIT.pngjpg|thumb|right|150px| Cross-section through a concrete biosand filterFilterpen NORIT]]
The FilterPen is a handy water filter in the form of a straw which filters the water by means of X-Flow micro filtration membranes. The membranes have an average pore diameter of 0,18 micrometers and a maximum pore diameter of 0,25 micrometers. It therefore removes mainly bacteria and protozoa. Viruses are not removed because they are smaller than the pores. If there are indications that the water to be purified is contaminated with viruses or if there are doubts about this, prior treatment should be given to the water before using FilterPen.
====Operation====
[[Image:Filterpen NORIT diagram.jpg|thumb|right|150px|Cross section of a Filterpen]]
The FilterPen weighs just 30 grams. The length is 200 mm with a diameter of 16,20 mm. The FIlterPen is used like a straw.
