Geberit MONOLITH PLUS Mode D'emploi page 26

Maintenance
Replace the filter
EN
Prerequisite
– Odour neutralisation wears off.
– Orientation light permanently lights up red.
CAUTION
Possible health hazard
Impurities in the filter could lead to contamination of
the breathing air.
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1
Hold the cistern lid with both hands, lift it up and
fold it towards the front.
Replace the filter annually.