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Minimum SO4


Reading through the online version of How to Brew it says the minium SO4 is 50ppm.  Is that generally accepted?  If so, what is the reason?

I don’t think that there is a minimum SO4 level. Unlike Ca++ and Mg++ it doesn’t seem to do anything to the process of brewing (at least I don’t remember seeing anything written). Certain styles may strongly benefit from it being above 50ppm, which is where that suggestion may have come from.


I have brewed with water with less than 10ppm of So4 without an conversion, hot/cold break, or flocculation problems in the finished beer. 


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