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Re: What's missing?

To: Aquatic-Plants at actwin_com
Subject: Re: What's missing?
From: Paul Sears <psears at nrn1_NRCan.gc.ca>
Date: Tue, 14 Mar 2000 09:54:44 -0500 (EST)
In-Reply-To: <200003140848.DAA17760 at actwin_com> from "Aquatic Plants Digest" at Mar 14, 2000 03:48:02 AM

> 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

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