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I don't use it for brewing just hydroponics, I add 'pH Up' to get the rainwater to seven. Depending on what you are brewing and how you brew will determine the salts you are going to use. Your base malts will act as a buffer lowering your pH probably further than you would be aiming for. In my last brew a dry stout, I added five grams of calcium chloride and one gram of lactic acid to get my pH to 5.4.But in saying that I don't mash my dark grains I only mash fermentable grist. All the others go in at mash-out.Without doing any calculations you will have to add some bi-carb to bring your pH up.My rainwater is between 5.6 and 5.8 pH.Is there any reason why you want to use rainwater?
I don't use it for brewing just hydroponics, I add 'pH Up' to get the rainwater to seven. Depending on what you are brewing and how you brew will determine the salts you are going to use. Your base malts will act as a buffer lowering your pH probably further than you would be aiming for. In my last brew a dry stout, I added five grams of calcium chloride and one gram of lactic acid to get my pH to 5.4.
But in saying that I don't mash my dark grains I only mash fermentable grist. All the others go in at mash-out.
Without doing any calculations you will have to add some bi-carb to bring your pH up.
My rainwater is between 5.6 and 5.8 pH.
Is there any reason why you want to use rainwater?