Use
Suction level indicator
This indicates when the dustbag needs to be changed.
^Set the suction power selector ( if present) to the highest setting and make sure the air inlet valve is closed.
^Hold the wand, with the floorbrush attached, off the floor. Turn on the vacuum and check if the red marker completely fills the indicator window.
^If the red marker fills the window, change the dust bag even if it is not completely full.
Note:
The suction level indicator measures the amount of air flow through the dustbag.
Even if just a few ounces of cement, plaster or brick dust are sucked up, these fine particles will affect the permeability of the dustbag causing the red marker to indicate it is full even though it is practically empty. The dustbag should be changed as the suction power is greatly reduced.
If the bag is bulging with wool or carpet fluff, but the air flow is still high enough not to activate the red marker to fill the indicator window the dustbag should be changed. Both of these extremes can occur.
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