Hi Fishlore, After having it sit in my Library for about a month now, I was finally able to open up my Bulk Reef Supply 6 Stage Universal Water Saver Plus - 150GPD System.This system is for my Freshwater Aquariums and I'm so glad that I can start making my own water rather than having to haul 1 gallon jugs here and from work. I haven't made any water yet because I had a few questions before I got started. 1. I know that you have to add essential minerals back into the water after taking them all out, is RO Right the correct product to use? 2. My well water has a TDS of about 600, should I use just RO or both RO/DI for my fish (Community Tank & Goldfish). 3. What products should I use to get my GH & KH to ideal levels. KH=4-8 and GH=4-12. Is this correct? What levels should you recommend? Can I use the API GH&KH kit to measure this. 4. After the water comes out of the unit will the pH match my tap water pH? What product should I use to get my pH to neutral. I really just need the most help I can get in regards to what chemicals and what to do with the water.\ Thanks for ALL the Help!