Coronavirus - Letter in Today's Daily Telegraph

[stevefrith]

Steve,
which filter cartridge is in your mask and how often are you changing it?

Neil.

Hi Neil, the one I'm using is

https://www.respiratorshop.co.uk/3m-4251-a1-p2-reusable-dust-mask-respirator.html

I've also a couple of Trend Stealth masks which are FFP3 but the filter in these only last up to 8 hours and it's impossible to find any stock