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Wet Thumb Forum] A New Filtration Concept: The Hamburger Mattenfilter
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8.7.3. Hamburg Matten Aquarium Filter
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Hamburg Matten Filters are space saving, non leaking and supremely efficient. HMF`s do better when not cleaned.
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How To Make a Basic HMF (Hamburg Matten Filter) for Shrimp Tanks - YouTube
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