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How long can worm casting tea last?

I have a worm bin, but I accidentally left it slightly ajar during the last rain. I noticed that the first bin was getting soggy for my worms, and so I drained the tea into a pail. Then, I left the pail out, and it rained some more. I know that if you deprive any manure-type of oxygen, it kills the organism. But I just make too much. How long does the worm tea last? Will it become toxic?

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