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I switched over to RO water and so began to add bicarbonate to bring the water up to the balanced profile. Adding 4g to my 5 gal batch resulted in a change of less than 1 ppm. I did the calculations by hand and, in my 8.75 gallons of water (33l), it should have added 87 ppm of bicarbonate. (adding 4g of baking soda, molar weight 84, 61 of which are bicarbonate equaling 2.9 g bicarbonate, divided by 33 liters = 0.088g/l = 88 mg/l, or ppm).