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Probably no info because you can start with 0 if you’d like... just need to make sure whatever nutrients you use will make up for the lack for minerals and such..
For what we're doing there's not much difference between 0 and 12. By the time you add silica, mg/cal and whatever cocktail of nutrients you decide on a few ppm are going to be a really small percentage of what's in the water. So it won't matter. I look at filtering the water as a way to insure you're mixing the same formula every time.