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Hey, way to go!! At least you HAVE a hard drive! If you don't have a back up external drive, get one! It would have saved me the 2 K it is taking to get back my pics and word perfect notes from a data retreivel company. Dell, by the way put in some crumby hard Drives in its computers from 2000- 2002. If you have one, expect it to crash at some point. They replace it without question but the lost stuff is not so easy to get back.
So you can see from this photo the different ages of biofilm stain on these units. Whenever a friend asked or I needed a portable biofilter I would pull out some plastic for the job. So you can see the different years. The oldest ( about 10-14 years old I would guess?) , as expected, is the darkest. The pic on the right is new media. I do have a shot of some media I kept in a lateral flow chamber for a couple of years- I'll see if I can scan it in----
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