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Grapefruit seed extract?

>Date: Sun, 10 Jan 1999 17:38:03 -0500
>From: Neil Frank <nfrank at mindspring_com>
>Fish Tank Algaecide
>At very low concentrations, grapefruit seed extract can be a most 
>algaecide for fish tanks, while
>offering very low toxicity to fish. As is the relative case with human
>consumption, at low concentration
>the ingestion of the extract is actually healthful to fish, while
>protecting them from infection. 
>In one test conducted in South America on coho salmon roes with eyes, 
>Carlos Roman, Zoologist for
>the Chile Foundation reported, "...the doses between 75 - 200 ppm(of
>grapefruit seed extract) do not
>effect the viability of the salmon roes." 
>Now an algae-free fish tank of any size can be maintained...Without the
>fear of toxifying its contents. 

What effect does grapeseed oil have on higher plants?


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