filters

We're collecting a range of resources from communities and projects focused on water and air filtering. (Lead image: @shanlter) This page needs organizational help! Please help by tagging content with `filters` or with `air-filters` or `water-filters`. Thanks! ## Questions [questions:filters] ### Water filtering [nodes:water-filters] ### Air filtering [nodes:air-filters] ## Activities [notes:grid:activity:filters]

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