It may be possible to salvage it. The first thing that would be helpful to know is how much free SO2 is in there. If you can open a bottle and take a measurement using a test kit or titret, we may be able to help you plan out the steps to reverse the overdose. It is likely that your batch may be off the scale when measuring and you may have to dilute it in half, or down to 25% in order to get a measurement. Once you get a reading, let us know.
I'm sure someone will suggest pouring it back in a carboy and aerating it, but for a massive overdose, that is unlikely to solve the problem. You are likely to need a dose of peroxide to have a chance of fixing it. This is not something that you want to do flying by the seat of your pants, so taking the measurements is important.
Medsen
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