By: Jason Livingston April 7, 2010

Because this filter pumps so fast (and because of the smallish size of the filter), one could conclude that the pore sizes must be larger than competing filters. That's simply not the case. The pore size for the HyperFlow is 0.2 microns and is effective in taking out the junk that will make you sick. In fact, you can rely on this completely to keep the bugs from getting into your water. The reason why it's so fast is due to surface area. The media used in the HyperFlow is called Hollow Fiber which has been used to filter blood in dialysis machines for about 20 years. It's essentially many small tubes that look like spagetti set into a piece of epoxy. The water is forced through the walls of the tubes (0.2 microns holes) where it then travels out to the bottle through the middle of these tiny tubes. Because there are so many, the water doesn't have to wait long to go through this procedure unlike a fluted or ceramic filter (Katadyn Hiker or MSR MiniWorks). The issues with Hollow Fiber really focus on the rate in which the fibers clog and the requirements of cleaning them (backflushing). Once this is mastered, the HyperFlow will be considered one of your favorite pieces of gear!

Helpful Votes: 0 Yes

By: ALM February 18, 2010

The MSR specifications indicate that the pore size is 0.2 microns, actually.

Helpful Votes: 1 Yes