Be careful if your using water softener water. The Na levels will be off the charts. You may not need RO water. Many people say consistent water quality is key to raising healthy discus. I installed an RO system in my house with enough capacity to do my water changes which meant $$$ spent. Guess what? I don`t even use it, what a waste of money. My water directly out of my well has a pH of 7.5-7.8 and is hard, about 15dH. My discus are thriving and growing like crazy. I only use well water. If I were you, I`d get a plumber in and install a faucet out of your well line before it enters your water softener line and consider using this. It will at least be consistent and not have the massive sodium content it must take to soften that water. Cosistency is key! not having to modify water will save a lot of headaches in the end.