I brewed this beer for a purpose. No, not just to drink, but to use for an activity during a brewing water presentation I gave for my local homebrew club — the PUBGuild. The purpose of this activity was to demonstrate how the sulfate ion changes the way one perceives hop bitterness in a given beer.
At high concentrations, sulfate adds dryness and sharpness to the hop profile. By brewing a beer with distilled or de-ionized (DI) water to control the water profile, it is easy to observe how calcium sulfate (gypsum) impacts the hop perception of a beer by adding a gypsum solution to the finished beer.