Wookii
Member
Hi @Wookii, I've never seen these before. A brilliant alternative if a sponge is an undesirable solution!
Cheers,
Michael
I'm a big maintenance-phobe, so digging around at the bottom of the tank to pull a sponge off the bottom of the filter inlet every week is a big no-no for me - I prefer to have the pre-filter (and I'd never be without a pre-filter) in the filter.