30ppi Hamburg Mattenfilter for 10, 15, 20L and 33L gallon tanks

All About Matten Filters Including How To Make One

Mattenfilter Shop - SWISSTROPICALS

Mattenfilter Foam — Volker's Aquarium Supplies

Mattenfilter Foam — Volker's Aquarium Supplies

Eheim Air Pump 400 - $67.00

10g Hamburg Matten Filter Shrimp tank

The HMF – What's That? — Seriously Fish

10g Hamburg Matten Filter Shrimp tank

Jainsons Pet Products BluePet-300F Submersible Aquarium Internal 3-in-1 Filtration Filter Mini Pump for Fish and Turtle Tank Power: 3.5W F.Max: 380L/H : : Pet Supplies