Hydrophobic filters?

Has anyone ever tried supposedly hydrophobic filters like these with a humidifier? They have a hydrophobic (won't combine with water) layer on each side of the filter layer, but what happens if water condenses between the layers?

http://www.directhomemedical.com/filter ... ilter.html
http://www.cpapfiltersandsupplies.com/filters/hepa.html

The first site has this caveat:

directhomemedical.com wrote:Some users find that using in-line Bacterial Viral filters can reduce pressure and therapy effectiveness in humidified CPAP/BiPAP systems.

This doesn't sound very promising, but maybe two could be used alternately, so that each filter had time to dry.