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

Blue Pet Aquarium Internal Liquid Filter BL-601F Suitable for 20-30 Litre Aquarium Fish Tank (Power: 6W, Flow MAX: 600 L/H) : : Pet Supplies

Mattenfilter Foam — Volker's Aquarium Supplies

Matten Filters are the best filtration for freshwater shrimp keeping and breeding. The amount of surface area the filter creates makes a great feeding

Matten Filter - 29 Gallon

Blue Pet Aquarium Internal Liquid Filter BL-1000F Suitable for 30-50 Litre Aquarium Fish Tank (Power: 15W, Flow MAX: 650 L/H) : .in: Pet Supplies

Mattenfilter Foam — Volker's Aquarium Supplies

Mattenfilter - SWISSTROPICALS

10g Hamburg Matten Filter Shrimp tank

DIY Matten filter for aquariums

Blue Pet Aquarium Internal Liquid Filter BL-1000F Suitable for 30-50 Litre Aquarium Fish Tank (Power: 15W, Flow MAX: 650 L/H) : .in: Pet Supplies