When To Change The Filter Bag - Miele S 8900 Operating Instructions Manual

Maintenance and care

When to change the filter bag

Change the filter bag when the colored
marker in the airflow indicator
completely fills the display in red.
Filter bags are disposable articles
and made to be used only once.
Dispose of full filter bags. Do not
attempt to reuse.
Clogged pores reduce the suction
power of the vacuum cleaner.
Check the airflow indicator
^ Attach the standard floor brush
(depending on model) to the vacuum
cleaner. All other suction tools can
affect the function of the airflow
indicator.
^ Use the On/ Off foot switch s to
switch the vacuum cleaner on, then
select the highest suction setting.
^ Slightly lift the standard floor brush
from the floor. If the color marker
completely fills the indicator window,
the filter bag needs to be changed.
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How the airflow indicator works
The airflow indicator is designed to
show when the bag is full of common
household dust and measures the
amount of air flow through the filter bag.
Normal household dust is a mixture of
dust, hair, carpet fluff, threads, sand,
etc.
However, if fine dust, such as drill dust,
sand, plaster or flour is vacuumed, the
pores of the filter bag may become
blocked. The marker will indicate that
the bag is "full" even when it is not. The
filter bag should be changed as the
suction power is greatly reduced.
If the bag is bulging with pet fur, hair,
carpet fluff, etc. the indicator may not
register "full". This is because the air
flow of the filter bag may still be high
enough not to activate the marker to
show maximum. The filter bag should
still be changed.