Hello all, I am looking for an inexpensive solution to blend to my liking RO water (already have the equipment) with my pre-RO water to add back minerals to the RO water. My TDS pre RO treatment is indeed 450ppm which gives a bitter taste, but has good minerals. So, I want to lower it to about 120ppm. The pH is slightly blow 7 for the RO and the pre-RO is 7.8, so I should end with decent pH after the blending. Thanks!!!
A couple of things to note:
1. TDS doesn't speak to the levels of individual minerals, and an RO system doesn't reduce individual minerals by the same percentages.
2. Water pH has little influence on mash pH. Alkalinity does.
Without analysis of your source water and RO water, you're guessing at what the outcome of blending the two will be, and assuming it will solve your bitter taste problem. If you're looking at 75% RO anyway, for the extra $ or less/batch, why not just go with pure RO and add Gypsum and/or Calcium Chloride as needed? They're cheap, literally, pennies per batch and you'll know what's in your brewing water. Either way, you may need to deal with mash pH as well.