I'm with Woketman, pleated paper filters are the way to go. My main tank has a pleated paper clunk made from a Fram CG3388 filter as shown in the link Woketman provided. Additionally I made a header/UAT by rigidly mounting a Fram CG3389 filter in a Sullivan 4 oz. round tank mounted upright. It's similar to the last photo in the thread referenced below. The CG3389 is the same as the CG3388 except it is 2" long instead of 1".

With this system I can run my turbine until the tank is bone dry. It's been totally reliable for 81 flights so far. Here's the thread from a couple years ago that convinced me to go this way.
http://www.rcuniverse.com/forum/m_20...Cfilter/tm.htm

Some of you would rather send Uncle Bob $60, and that's fine if it makes you feel more comfortable.

Joe