A fifth of a gallon at the end of the boil?Good luck. That video is from member @Bassman2003 . I didn’t mess with the pressure cooker part of the video and just used a large blue speckled enamel stock pot I had. I wrapped it with a couple layers of Reflectix and used those little balls for insulation on top. It’s actually not too bad to drink straight when it’s done and I would describe the taste as Welch’s white grape juice. Another member I consulted with told me “If you get Stinky, putrid or vomit then something went wrong.”Mine finished with a pH of 3.5. I’ve been adding about 24-28 oz to a 5 gallon batch near the end of the boil. I think the exact amount depends on personal taste and a little bit of luck.
OT
@Section1 HB English mild.
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That's an awful lot...
I'm assuming you're not using it in the mash? The math doesn't make sense, and my tap water is a whole lot softer than boiled Munich water.