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The mash pH is a measure of the acidity or alkalinity of the mash. Mash pH affects conversion efficiency and, to some extent, fermentability. The mash pH should be in the range 5.1-5.6, with 5.2 considered optimal.
1
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RO Water Sanity Check
I would expect RO water to lack the carbonates to buffer your mash pH. The water I tend to brew with has pH 7.2-8.0 mean 7.61 depending on time of year and a hardness as CaCO3 of ~270 ppm. This offers …
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votes
How to test mash for ion concentrations
Commercial brewries in the UK, as Grain Mother points out will start with the water quality report provided by the local water company. Smaller breweries here in the UK will reguallay send of samples …