March 21, 2005

Filter Update

The gravel-in-a-jar filter I made last week is performing better after a minor modification. The standard airline was smaller than the narrow end of the funnel, but not by much, so the stream of exiting bubbles was intermittent (glub, pause pause, pause, glub, pause, pause, glub, ....). I added a length of micro tubing to the airline, and now the bubbles are flowing in a gentle, steady stream.

Yesterday the glub-pause-glub started up. Oh, no! On inspection, one of the snails tried to go into the funnel, blocking the opening temporarily. LOL Everything is back to normal now that the snail got out of the way.

Here's a quick picture. You can't see the bubbles and the fish are blurred because I used ambient light...

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