growonix is great products little pricey but great.. as is most other ro systems.. its all about your filters you get wich determines how clean your water gets.. i own growonix ro, active aqua ro, and a hydrologic ro system.. they all do the same there all able to be dialed down to a 1:1 ratio ro:waste

just make sure you get a good kdf carbon filter and a good sediment filter.. and change them after you have pushed the recommended gallons through the filters.