Filter for fabric face mask

WHO recommends that fabric face mask to be made of at least 3 layers of fabric:

• Inner layer of absorbent material, such as cotton.
• Middle layer of non-woven non-absorbent material, such as polypropylene.
• Outer layer of non-absorbent material, such as polyester or polyester blend.

This filter is 45gsm and made to be the middle layer of fabric facemask. It is advisable that the middle layer or filter is replaced after each use.