Hamburg Matten Filters are space saving, non leaking and supremely efficient. HMF`s do better when not cleaned.
Amazon.com : AQUANEAT Aquarium Filter Sponge Open Cell Foam Sheet Bio Sponge Filter Media Pad HMF Fish Tank Sump Divider (23" Lx 12.25" W x 2" H, Blue) : Pet Supplies
HMF Corner Filters Made to Measure
Mattenfilter - SWISSTROPICALS
Hydrodynamic Mattenfilter - Aquatica Aquarium Gallery - Tropical Fish Store Cleveland Ohio
The HMF – What's That? — Seriously Fish
Mattenfilter - SWISSTROPICALS
Our 28cm high Mobile Hamburg Matten Filter: https://www.envobeeshrimp.co.uk/product/hmf-biological-sponge-filter-black-10x10x28cm/ | By Envobee Shrimp | Facebook
How a HMF (Hamburg matten filter) Works - YouTube
HMF 23 CM | Your Aquahouse
Building a Hamburger Matten Filter (HMF) for an Aquarium : 4 Steps - Instructables
Premium HMF Stand/Hang-On GTM Filter - Medium Edition
The HMF – What's That? — Seriously Fish
Scapefactory HMF Mat Filter Hamburger Mat Filter Fine (30ppi) with Air Lifter with Lid for Aquarium, Black : Amazon.de: Pet Supplies
my DIY cheap HMF | Capital Cichlid Association
Aquarien HMF Filter Konvolut mit Lufthebern in Nordrhein-Westfalen - Jüchen | Aquarium und Aquaristikzubehör günstig | eBay Kleinanzeigen
Poret Hamburg Matten Biological Filter Set Foam 45x31x5cm Media shrimp fish HMF | eBay