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The HMF – What's That? — Seriously Fish
Corner H M F - Do-it-yourself - AlbertaAquatica
The HMF – What's That? — Seriously Fish
Hamburger Mattenfilter for a low tech setup, Page 12
HMF aquarium filtration - Ball Aquatics
Hamburg Matten Aquarium Filter
Our concave filters with the electric Pat-Mini drive are the ideal complete package., Equipped with the whisper-quiet pump and the chosen attachment,
Concave HMF with Aquael Pat-Mini
Building a Hamburger Matten Filter (HMF) for an Aquarium : 4 Steps
Der Hamburger Mattenfilter (#93)