Dear Ivan,<o></o>
I assume you have one of the first manuals.<o></o>
Our experience shows that there is no need to clean this filter every 10 flights.<o></o>
This suffices at the 25 hour service.<o></o>
BTW the warranty wont avoid by remove the front cover, this is needed even in case the temperature sensor must be changed.<o></o>
I hope this can help you.<o></o>
Best regards<o></o>
Udo Töpfer<o></o>