Before the pump there is a Festo Micro Filter wich guarantees that no particle at all can reach the pump!

Oh yes, I meant "reusable" but the other word was quite impressive or not

I get the feeling that this discussion is more a philosophy item. Have a UAT or not. Most of the used arguments have no technical background. Seems to me like "which car is best, BMW or Mercedes"

As I said nearly all german RC Jet Pilots never used a UAT and all these engines work fine under all conditions and also the one's I have seen with UAT did their job. So, I think its up to everybody to use the system which he feels best with.

Andreas