The importance of P R E .

[Wood spinner]

This IS very important , I have seen lots of turners not using any personal respiratory equipment especially on youtube.
I now keep my headset and filter equipment on ALL the time I am in my workshop . The fan unit is on a belt behind me .

This is a result of about 15 hours since I last changed the pre filters ( The filter unit has 2 installed) . The photo show 1 new and one old used filter , It was worse than seen but I dropped it on the way back to the house and a fair proportion of dust came of the filter

This IS the evidence that we should all take this seriously 

No P.R.E and all this lot ends up in your lungs 

[Bryan Milham]

Can't argue with the visible evidence.

[Derek]

I use mine when sanding or doing anything that is even slightly going to cause dust. I even vac up at the end of the day so that when starting again the next day in the shed I can do work not involving dust without kicking more up.
My filters look like that some days and yes it does just show how much dust is there even when you think there is none

[seventhdevil]

as a non wearer i'd be interested to see an experiment of this filter having had 15 hours use and a different 15 hours with no turning and sanding but wearing either in the house or outside or near a busy street just to see what is in the air we are breathing in everyday without our favorite pastime.

[Twisted Trees]

as a non wearer i'd be interested to see an experiment of this filter having had 15 hours use and a different 15 hours with no turning and sanding but wearing either in the house or outside or near a busy street just to see what is in the air we are breathing in everyday without our favorite pastime.

Can't really imagine myself wearing my mask to the supermarket... but I take your point!  I am selective when I wear it, I tend not to for turning but always for sanding, I also have good extraction. My most common error which I am aware of is cleaning up the workshop I intend to use the vacuum rather than sweeping but know I should be more careful.

[Wood spinner]

as a non wearer i'd be interested to see an experiment of this filter having had 15 hours use and a different 15 hours with no turning and sanding but wearing either in the house or outside or near a busy street just to see what is in the air we are breathing in everyday without our favorite pastime.

Buy one and try it out as I am not going to work and shopping with my PRE on 

[Duncan A]

as a non wearer i'd be interested to see an experiment of this filter having had 15 hours use and a different 15 hours with no turning and sanding but wearing either in the house or outside or near a busy street just to see what is in the air we are breathing in everyday without our favorite pastime.

Interesting idea. There would be no real need to wear it to the shops - just disconnect the hose and mask and run it whilst going about your business. Or, easier, wear a white shirt and look at the collar after a day of wandering around the town centre.
Or keep away from the town altogether!

[John Plater]

The nose is a pretty efficient filter as instanced in the hanky each time it is blown ! I have become especially sensitised to Laburnum and Yew so when sanding them I wear a FPP3 face mask inside a blown air full face shield with extraction on the machine and a workshop air cleaner above. The latter gets very dirty which could be down to poor extraction or the sheer amount of dust produced. I don't sweep up but use a vacuum. (I also wear gloves to prevent absorption of toxins through the skin but that is another issue)
ATB John