The filter becomes active as soon as you remove it from the packaging. You can easily place it on the outside of the medifilter. It’s best if you replace it every six months. Buy the original filters and products for the FilterQueen and Defender at EuroQueen.
This filter removes the odours and gases from the air and is available separately ( = good for 6 months)
Or in a pack of two pieces = good for 12 months.