I've just ordered from biotraxx.eu. reviews were few but good on Amazon. Same strength as you mentioned here. They do DMSO and free UK postage over 99 euros. Here's hoping. I'd bulk bought the normal water purifying drops not realising they were only 2.9% sodium chlorite!
According to Andreas Kalcker, who has become Jim Humbles predecessor, the percentages are 25% and 4%. I'm no chemist but I think it's safe to say a 1% increase of hydrochloric acid won't make much difference
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