How the vacuum cleaner bag change indicator works.
The vacuum cleaner bag change indicator does not refer to the volume of dust vacuumed, but to the extent to which filtration is still effective. If you have vacuumed more substantial soiling (e.g. large leaves from house plants), then the vacuum cleaner bag will fill up quickly, but the fine filter pores will not yet be saturated.
Replace the vacuum cleaner bag so that it fits more loosely in the dust compartment, allowing you to remove it easily.
