My yep water is hard as nails and I end up using over 1ml / L of CRS for some styles. This uses a lot of CRS and also adds lots of other things to the water that aren't always desirable. So, I'm thinking of getting some food grade phosphoric acid and using that, but it's not listed on either the forum or Graham Wheeler JBK calculators. Can anyone point me in the direction of one that does list it and works in the same way - i.e. input all your water values, choose your target style and water volume and it gives you hire much acid, Epson, gypsum etc to use? I cannot get my head around the Brewer's Friend one that seems to work backwards.