That's very hard water, one option is RO water, or a mix of RO and tap. I've been known to use dehumidifier or furnace condensate.Here's a water sample print out want to see what other people think. I've been using some of this water on my current set up befor I move to new proptery. Just wanted to see if I would run Into issues. Four strains rooted clone usual feeding for 3 weeks no issues so far. Only problem I've been having is constant ph rise in my drain to waste resi. Something I definitely need to figure out as I'm frequently gone 3 days out of the week.