The Planted Tank Forum - View Single Post - Cheap DIY liquid doser
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post #15 of (permalink) Old 04-24-2007, 05:17 PM
Are these real?
Wasserpest's Avatar
Join Date: Jun 2003
Location: Monterey, CA
Posts: 15,385
So the trick here is to find a hole/slit/perforation size that is small enough to resist a little bit of air pressure, but large enough to allow liquid passing through without plugging up over time.

What would happen if instead of the perforation in the cover the container would just be left open?
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