Yeah, HCl is fine for hydro. Do you have no way of collecting rain? If you could, that would be great and less expensive. It's also better on the environment considering the RO units lead to a lot of concentrated waste and are a waste of water. I know that they have improved, but just a couple of years ago the norm was that you wasted 2 gallons of water for every gallon you get in an RO system. And the membranes are expensive, too.
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