I use what is recommended by Terry Foster in "Pale Ale"
For ordinary, special, or extra special, he recommands:
Ca 50 - 100
SO4 100 - 200
Cl 20
I shoot for Ca 75, SO4 150, CL 20 and am very satisfied with the results.
However, my water report says the Ca varies between 8 and 40 ppm, SO4 varies between 5 and 33 PPM, and Cl varies between 5 and 35 PPM, so I never really know what I'm getting, but I base my water treatments on the average and don't notice any batch to batch differences.
-a.
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