http://www.championtrees.org/topsoil/bioponics.htm
In their closed cycle, self balancing system, mineral salts as plant food are replaced by natural nutrients from a biological source: fish effluent. This practical, ingenious system needs no expensive equipment or patented parts, and uses easily available materials to grow safe, chemical-free, superior quality food. And is adaptable enough to provide family food supply, or expand to commercial scale.
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