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Re: Undergravel or UGF Problem?
>Date: Tue, 2 Jan 2001 10:35:54 -0800 (PST)
>From: Cavan <millsman7 at yahoo_com>
>Just out of curiosity, I have this question about
>undergravel heating. Wouldn't it be possible for
>heated water coming up out of the substrate to bring
>up things with it that should probably stay down
One of the benefits of heating coils is to move nutrients from the water
column to the substrate where they can be bound to negative binding sites
(provided by laterite, for example). Thus you don't really need to put stuff
in the substrate (Jobe's sticks, little clay balls, etc).
Another benefit of heating coils is to move waste material out of the
substrate - alleochemicals, by-products of biological processes, etc. Water
changes then can remove them from the system. Of course, some waste products
will circulate back into the substrate along with nutrients, but that
doesn't seem to reduce the overall effectiveness.
George Booth in Ft. Collins, CO (booth at frii dot com)
The web site for Aquatic Gardeners by Aquatic Gardeners