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Thanks PP - I did try and adjust my water in the end, but evidently didn't get it quite right as mash pH was down around 4.7-4.9. That being said, seemed to get the right amount of sugars out of the grain and the wort tasted alright to me going into the fermenter so we'll see how it comes out..........

Thanks Rick, good to know I'm more worried about pH than the HCO3 content - the reason I had all those salts instead of just gypsum & chalk was to hit the profile numbers better, maybe I'll simplify (especially for the first brew) and not worry too much about Mg & Cl. I hadn't realised acid malt is ...

Thanks safebrew - I have put the grain bill into the Bru'n' water spreadsheet tool and tried to calculate the required salt additions - I can get everything to match up pretty well, with the exception of the HCO content - I need to add acid malt and some lactic acid to get the mash pH down to 5.2-5....

Ok, I have been using the brewersfriend.com water calculator and I can get the ion profiles right, but when I put in the grain bill I end up ~pH 5.8-6.0 and when I add some lactic acid addition to bring the pH down to ~5.4, this kills the HCO numbers compared to the target water profile, which makes...

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