(disclaimer) The "Ka-Chu" facecover is not certified for medical use by NIOSH, the responsible U.S. federal agency. Neither is it a substitute for social distancing recommended by the U. S. Center for Disease Control (CDC).


Ka-Chu Facecover

Product Testing


1. Enfold 1 teaspoon Bob's Red Mill
Finely Milled Tapioca Flour in a
12" square swatch of cloth or mask
to be tested.

2. Form a pouch by gathering the
corners as needed and sealing
the edges with blue masking tape.

3. Rap the pouch vigorously around the
insides of a clear glass bowl.

4. Backlight the bowl and inspect for
flour residue on the sides.

5. Compare the amount of residue found
with results of other materials you
test. Take photos and notes.

Test it yourself....your left-over
tapioca flour will make great pudding!
( they say, the proof is in the pudding)

youtube video of test:
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compare filtration: n95 to ka-chu



an older person
wore a snug fitting ka-chu
seattle summer

rode a bike for miles
up and down seattle hills
took a few rest breaks

Breathability -
a plastic bag filters well
but makes a poor mask

testing images