I currently water with well water, which is pumped from the same well as my house water. Our well water is actually quite good, but it's high in calcium and other minerals (no chlorine) which causes significant leaf spotting. It's also very alkaline. My plants grow well, but it's time to improve my culture further. I'm considering R/O, but am going to need a pretty big system. My shadehouse is 24'x36' and I water nearly every day for 10-15 min. Anyone here have a system they recommend? I'm looking to those folks who have greenhouses/shadehouses, and/or use a high-capacity system. I've looked at a number of articles online, such as the one found on Ray's site, but if anyone has a really great source of info that pertains to this specific topic, I'd appreciate the lead. TIA!