Result: Immediately order an ordinary sand filter system.
This here has made the value for money the best impression. This is confirmed quite well in practice.
The manual should be drawn on the net, but this is the lesser evil. The structure is quite simple, the unit was ready for use within one hour and "angenüppelt" installed by the pool.
Our pump runs on average every 3 days approx 2-3 hours, at a hochfrequentiertem use.
We are very satisfied!