91% should be fine to use in place of the 99% but do not put more than 10-12 grams of PH into the brew (240 mL). The extra water will cause precipitation problems above that amount.
91% should be fine to use in place of the 99% but do not put more than 10-12 grams of PH into the brew (240 mL). The extra water will cause precipitation problems above that amount.
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