Nutirents for hard water

fertilizer is fertilizer.. brand is mostly irrelevant except for their needless choice to split it up into 12-20 different products, some of which are useless. I have hard water. It might impact how much Mg or Ca you need to add, but the plant still needs the various nutrient molecules in the right ratio and concentration. 1.2-1.5EC from your nutes... plus whatever the water adds. 300-500ppm hard water is about where you have to at least observe and react. I'm around 300 and have zero issues. YMMV above that and relative to any differences in local water supply. i'd focus on that first, then try including your other additives one at a time to make sure it all goes smoothly, if concerned. This way you can see when/where the problem arises, if it does. Nutrients, first, then the gimmicky shit.