The filter for the anti-smog mask is its heart - the element on which the effectiveness of the protection against pollution and the hygiene of the use of this accessory depend. It must be replaced regularly to guarantee effective protection against smog and other hazards. If you're using a Respro® mask, it's essential to get an original filter for the brand's anti-smog masks. This will give you the assurance that the filter layer will be fully compatible with your mask and provide reliable protection.