Hamburg Matten Filters are space saving, non leaking and supremely efficient. HMF`s do better when not cleaned.
The HMF – What's That? — Seriously Fish
Any tips you wish you'd known before making a matten filter (HMF)? I'm going to silicone plexiglass to make chambers. Is 1.5” W x 14” L x 11” H a decent filter
Printed Hamburg Matten Filters - Biotope One
10g Planted Dual-Betta Tank w/Matten Filter | Aquatic Plant Forum
Mixed Cichlid aquarium with a refined Hamburg Matten Filter - YouTube