I think they've just been fazed out with newer technologies so the surplus ones are getting harder to find. Plus the fact that they work really well, I think folk are hanging onto them now.
You could maybe try Kev at Endicotts and see if he can get hold of any ...
Got mine years ago from Life Support Training Services up in Millom. I don't know if they have a website or still sell them but what I can say about them is something they mentioned on their Expedition skills course years ago, that was to never trust a ceramic filter because you don't know if anybody has dropped the thing and cracked the filter inside where you can't see. Millbank bags are much more reliable.
If you have never used one before then it's worth pointing out that you must give it a good soak before use otherwise it will just hold the water rather than letting it drip through.
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