My citric acid/soda system seems to never run out. I haven't seen the level of citric acid drop more than a half inch over 2-3 weeks, and the soda/water mix bottle seems to always have some undissolved soda left. I have renewed the mixes once, just to try a stronger acid mix, not because it ran out. At low bubble rates it must be good for at least 3-4 weeks. But, I'm having trouble maintaining the bubble rate, readjusting it every morning, so perhaps it lasts so long because most of the day, with lights off, it isn't working. I'm thinking of plugging the little tee fitting that is in the hose that is in the soda bottle, to see if that makes it work more constantly.
Very interesting, and very different from what I see. Maybe I do have a leak somewhere, even though I have repeatedly tested it and never found a leak. Mine also never builds up pressure enough to show on my gauge. It did build up a lot of pressure back when I was just playing around with it, but never since I connected it to my tank. That also hints that there is a leak somewhere. Time to blow some bubbles!!
Odd that yours doesn't use the citric acid up. Here's mine after 4 weeks. Acid is all gone and bottle empty. The pressure is pegged high on the gauge. It probably has enough pressure to last another week or two.
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