Miele S500 Operating Instructions Manual page 33

Depending on the model, the vacuum
cleaner will be equipped with one of the
following exhaust filters:
"SUPER air clean" filter
"ACTIVE air clean" filter
"ACTIVE HEPA" filter
–
A "SUPER air clean" filter is supplied
with every box of Miele dustbags. It
should be replaced each time a new
box of bags is started.
–
An "ACTIVE air clean" or "ACTIVE
HEPA" filter should be changed
approximatetly once a year. Change
the filter sooner if it is obviously soiled
or no longer effective.
It is helpful to make a note of the date
directly on the filter as a reminder for
when to next change it. See "Optional
Accessories" for filter descriptions.
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