Yep, about 20 litres - they're charcoal based filters so would expect black rather than white. I usually get a little black residue when changing them. So, I took the cover off and found the fibre / paper based boiler gasket looking a lot worse for wear, with one spot an obvious leak. The element gasket (another fibre one) is also in need of a change. I used fibre based gasket to ensure a good seal, which it did. But, unfortunately they have crap longevity. I'm got some spares which I'll fix it with now but will order a set of teflon ones. The fibre ones look like they should be an annual job :o as they obviously don't stand up to the job very well.. Anyway it's now descaling so after a few hours I'll open the boiler up and take a peek inside Interested to see how much scale its accumulated with the filter setup I have.
