Are air filters necessary on Pitot, static or TE lines?

It was actually a paper motorbike fuel filter. The idea that the paper
would absorb any water. I did several cloud climbs post installation
without any issues. Sadly, I no longer own the glider.




At 13:10 12 December 2018, Pete wrote:
Interesting. Thanks Mike. What kind of water filter are you using? I
wonder
if really fine filtration (osmotic, etc) would have any negative effect
on
the rate of change of air pressure and thus affect instrument reading?