"I would expect something better from a model advertised for pet homes..."
Yes, you probably would but SEBO filters are not the same as others in other vacuums - the charcoal layer for a start is stitched underneath the white felt on the filter shown in reply No.7. SEBO also make a standard non-charcoal microfilter that is available although the U.S have a HEPA cartridge made with paper pleats (yellow framed) - SEBO in Germany have done extensive tests on the U.S HEPA filter and what I've been told, it isn't as good as the ones SEBO make for worldwide use.
To be fair, Matt's photo of the Anti-odour charcoal filter is a lot whiter than mine. When it starts to turn black or a deep grey, that's when it is time to replace it - and that filter on board alone can last up to 32 dust bags. For an upright that is a year old, I'd say Matt's filter is looking jolly good.
I was visiting another forum the other day when someone asked me online about a washing machine brand that I had never heard of before. I discovered the website many years ago and they have very good, accurate (mostly) information:
http://www.ukwhitegoods.co.uk/
They also have a very well informed SEBO brand page that states the following (and I couldn't put it beautifully myself)
"Bagged cleaners, like Sebo on the other hand, perform brilliantly out the box, continue to do so and get a whole new lease of life when you replace the bag and filter, it's like having a new cleaner all over again as the whole filtration system is purged..."
The most important aspect on this bagged vacuum is that the filter on board does a great job. SEBO have as yet to produce synthetic HEPA dust bags for the X range but the paper bags they have been selling for the best part of 20 years has already been classed as S-Class, which was the old name for HEPA and used in hospitals etc are paper and do a great job, regardless.
I have tried copy synthetic dust bags but they pull away from the seams due to the fact that the bags weigh an absolute ton when they require to be changed over.