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Perchlorates are highly soluble, aren't they? So, leech them out.

I anticipate growing things on Mars will be more like hydroponics than conventional agriculture. You're investing in a pressure vessel to contain the crops, so the cost per unit area is already quite high.

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Aeroponics is probably a more realistic solution given the levels of water. As long as you could finely control the ratio of dissolved solids there's not much of a benefit for hydroponics perhaps beyond thermal insulation over aeroponics I think. I am not an expert though. Perhaps there's something I haven't considered though like external pressure for the plant's root vascular system provided by a hydroponics reservoir over aeroponics.

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