Are there any comparability issues with B-ionic and BRS two part additives? I have some B-ionic part 1 (alk) left over but will also be using BRS part 2 (Ca). Any issues or use BRS part 1 too.
No problem. At worst you are mixing carbonate with bicarbonate, depending on how each is made, which is not an issue.
But keep in mind that concentrations will very likely be different.
