moonpod,
i've had a look at the
www.Royal-Exclusiv.de (Vendor of Red Dragon) website, were Klaus Jansen, the manufacturer stated (in German forum and language on site) that the cleaning interval is depending on how much kalk you have in your system and how good your buffersystem works.
One should not dripp Kalkwater near the pump.
If using pump for the first time, one should check afer 3 month and have a look on how clean it is, expanding that period for the next time, if it was ok.
One should check at least once a year for safety.
One should not use concentrated acids for decalcifying, and max. 10 min. on heavily thinned acids (HCl for instance).
Thats all i could figure out.
Ralf.