Duo DFR backwash filter with pressure reducer flush/clean

Hello dear forum!

I hope that I am in the right place in the category "Sanitär"...

The following:
We have installed at home a "Duo DFR backwash filter with pressure reducer (47-286.22 0612)" from Richter and Frenzel. How can the filter be flushed and how often should this be done (unfortunately I have never done this since 2013 (!) and only just became aware of it)?
:-(

Are there hoses that can be attached to bridge the way from the "Duo DFR" to
the drain?

Photos attached...

I would appreciate a reply.

Thanks.

Regards,

Max

A 50mm HT pipe fits at the bottom, with that you can then lead it into a [Gully].

Hi

Derivation as described above, alternatively place a bucket underneath.
Operation is presumably the black handle pointing towards the wall at the bottom.
Backwash monthly

Olli

A bucket will do. It might splash a bit but you turn it around once within a few seconds and that's it. After that, you have 3 liters in the bucket. At least that's how it is with us.