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size, personal membrane filtration anywhere How can I tell if my FilterPen is still working?

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size, personal membrane filtration anywhere How can I tell if my FilterPen is still working?

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The primary function of the FilterPen is to remove micro organisms from your drinking water. The microfiltration membranes inside the FilterPen work as a fine sieve on which bacteria and protozoa remain. The more contaminated water you filter the more micro organisms will build up on the membrane surface. Eventually filtered micro organisms and suspended solids will form a layer which can block the membrane completely. The flow rate will however drop gradually until the FilterPen shuts off completely. To raise the flow rate the membranes can be cleaned with included cleaner tablets.

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