martenskram 0 research notes and 0 wiki edits | Joined over 3 years ago





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"I hate to be pessimistic, but even a medium efficiency supply air filter is probably more effective in removing the dangerous particles (respirable..." | Read more » over 3 years ago
"Thank you for sharing this very nice project! In a comparable climate zone in southern Sweden we must have more earthworms (eating the dead leaves)..." | Read more » over 3 years ago

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