kiwipen
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When I make starters I put aluminum foil tightly around the opening of the erlenmeyer flask. This is to prevent fruit flies, dust and other unwanted things to get in.
Does this hinder oxygen from getting in? Are there any filters that can be used instead that will allow it to breath, but keep out particles?
Does this hinder oxygen from getting in? Are there any filters that can be used instead that will allow it to breath, but keep out particles?