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If you are finding the suction is failing on your Numatic 356mm vacuum cleaner, and have already replaced the bags it may be time to change your secondary filter. This is a basket filter, which is the last stage of filtration after your dust bags in your vacuum cleaner. It sits on top of the drum and prevents both dust from escaping the vacuum cleaner and the motors from foreign objects.

If this filter becomes dirty and blocked, it can reduce the suction of the vacuum cleaner and it needs to be replaced.

This filter fits 570 & 900 models which acts as a dry filter.