Revers Osmosis System Advice Needed

[Ann Oaks]

I have been growing around 120 orchids in a 12 by 16' greenhouse attached to our house for about three years and need help with a ro system. Our well water is drawn from an area rich in lime stone and is as hard as a stone. We have had a water softener for 40 years and, of course, I cannot use treated water on my orchids. I have been collecting rain water in three 60 gal barrels, but ran out by late March this spring. We also have a problem with low humidity and high heat in the summer-- the exhaust fan and vents help, but I would like to mist to bring down the temp and raise humidity.

My only option seems to be a reverse osmosis system to remove the salt etc from treated water. Our plumber installed a faucet in the greenhouse -- so we do have a water source. I know nothing about these systems -- can someone help me?