How often do you change your screens?

[WeedyBoyWonder]

I don't have a set time period, but once they are totally blacked up and air doesn't pass though easily.
Although saying that, I do like them after they have been used a few times, but the first hit from a clean gauze always blasts me.

WeedyBoyWonder Reviewed by WeedyBoyWonder on 09-06-2007. How often do you change your screens? If and when you use them.. Rating: 5