Today I brewed my "BlueHouseBrewhaus'-Monteith's Summer Ale Clone-Clone" Lager (what a name) with my small batch setup (5ltr).
I do have quite hard tap water (13,2°dH carbonate hardness : 74,1 mg/l Ca, 21,5g/l Mg). For large batches usually I treat it to reach like 0-2°dH for lager beers, but...