I watched a commercial for the Aquaguard Enhance RO+UV water purifier recently.
In that commercial, a science teacher assigns an experiment to students. The students bringing a plant to school, and observe its growth over several days. One student's plant looks more fresh and healthy than the remaining plants. When teacher asks the reason, the pupil says he used water from an Aquaguard purifier.
The reason they gave is that the purifier discriminates essential minerals and doesn't remove them from water. I did not find this reason plausible.
Does proof that watering plants with purified water yields better results when compared to watering with tap water?