I'd love to see some pics of the sump with the jap mat in it, that's the exact same reason I've not gone for filter socks with my build. How often do you clean the matting? How does it compare in terms of fineness to Poret foam?
Thanks for the link, i think i'll source this and try it out actually.
Have you used it before?
Would you be able to recommend a particular PPI and how many layers of which?