Learning more about Paper Filtration . . .

. . . one step at a time

Unlike folding quadrants, pleating a fluted filter is not that easy and require some training or some patience. We propose an 8 steps method using symetry to improve the consistency of the pleats.

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There are a few different methods to fold a filter paper disc into a funnel-ready quadrant.
We propose an easy 3 steps method bellow.

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Why some manufacturers express the filter's permeability as pore size while other use retention? And what the difference between pore size and nominal pore size?

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Have you ever tried to compare filter paper between brands? Found a few cross-reference tables only to find out they contradict each others? You might have wondered how come nobody came up with a standard to describe grades and make sens of this mess?

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