Science - recent inventions that benefit mankind - child led research

- LifeStraw Membrane Microfilters

 LifeStraw’s membrane microfilters are made of hollow fiber membrane technology – a similar technology used in kidney dialysis. These membranes are made of small straws that contain microscopic pores of 0.2 microns in diameter. Dirty water enters one side of the straws and clean water passes through the pores while bacteria, parasites, microplastics, dirt, silt, sand and cloudiness are blocked and unable to pass through because they are too large. The result is safe drinking water flows into a clean chamber for drinking while contaminants are blocked. LifeStraw’s membrane microfilters are capable of removing 99.999999% (log 8) of bacteria (including E. coli), 99.999% (log 5) of parasites (Giardia, Cryptosporidium, etc.), and 99.999% (log 5) of microplastics.

- LifeStraw Membrane Ultrafilters / Purifiers

The difference between microfilters and ultrafilters is the pore size – LifeStraw’s microfilters have a pore size of 0.2 micron while the ultrafilters have a pore size 10 times smaller: 0.02 micron. Both technologies work via the same mechanism, but ultrafilters (because of their smaller pore size) also remove virus (in addition to bacteria, parasites, microplastics, silt, sand, and cloudiness). Because of their smaller pore size, ultrafilters also often have a slower flow rate or require more pressure than microfilters. LifeStraw’s membrane ultrafilters are capable of removing 99.999% (log 5) of viruses, 99.999999% (log 8) of bacteria (including E. coli), 99.999% (log 5) of parasites (Giardia, Cryptosporidium, etc.), and 99.999% (log 5) of microplastics.

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