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Re: What's missing?

> From: Chuck Gadd <cgadd at cfxc_com>
> Subject: What's missing?
> While doing this weekends water change, I once again observed MASSIVE
> pearling after the water change.  I get some bubbling normally, but not
> steady streams of bubbles.  Following the water change, the bubbles were
> being produced so fast they formed solid threads to the surface.  I really
> want to know what is missing in the tank normally that is present in the
> tap water?

	Kevin Conlin had this a few years ago.  I went down there (Montreal)
and we did some experimenting.  We came to the conclusion that it was
caused by dissolved gas in his tap water - probably air.  The excess comes
out of solution whan the pressure drops (from about 600 kPa to 100 kPa)
and lots of bubble nucleation sites become available (on the plants).

Paul Sears        Ottawa, Canada