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To avoid breathing in contaminated air, change your breathing air cartridge regularly.
Filter manufacturers recommend replacing your air cartridges every three months OR every 400 hours of use - whichever comes first.
If you suspect that your filter is delivering poor quality air, be safe and replace it. A damp and mouldy filter cartridge can be extremely harmful to your health.
When changing your filter, note the date the new filter is opened and be sure to put a reminder in your planner for a changeover.
It is important to note that the recommended replacement timeline begins once the new cartridge is removed from it's airtight plastic packaging and hits the air.