Conveniently enough for everyday use, but leaking

Both Vorrezensenten expressed my own soul:
-> Installation instructions missing,
-> Description of the items is missing,
-> A complete sealing is not possible, the large sealing ring had a crack glued, but further leaking. Accordingly, it is likely to be a systematic error.
-> Otherwise, the filter effect is good. I'm curious how quickly the filter is full sets (Figure 1).
The box on the specified range of 5 bar (max. Working pressure) and 10 bar nominal pressure seem to refer only to the plastic material and not on the seals.

Conclusion:
Good approach, incomplete version, therefore only 3 stars.

Updated on 24.04.2013:
In the meantime, I have wrapped the thread with wide teflon tape three times and plan carefully turned the tank again - now he is (almost) close (Figure 2)!

Updated on 15.09.2013:
The cleaning of the filter is necessary weekly. In the meantime I have bought myself a cleaning brush, as the filter is completely disassembled and the ultimate cleaning part is a plastic tube which is well-brushed out.
The Teflon tape had been once be supplemented.

New conclusion:
In everyday use, well, so one star to 4 star.