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?

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    Please find the commercial and the name of the company/product and add that to your a question. – user22865 Dec 19 '17 at 7:32
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    @NogShine Does "purified" mean clean to drink, or completely distilled though? Your premise seems to be a filter that "discriminates essential minerals"; which implies it's not distilling; but instead removing contaminants. You claim purified water is devoid of essential minerals; but my understanding was that the filter in question didn't remove them. So essentially the notable claim you cite is different than the question asked. – JMac Dec 19 '17 at 16:27
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    Until we find the commercial, it isn't clear which model of Aquaguard purifier is being used, but if it is the Aquaguard Classic it is NOT distilled water. It is a three-step process: filtered, another step (ion-exchange, I think) and then exposed to UV to kill bugs. I've edited out mention of distilled water as a red herring. – Oddthinking Dec 20 '17 at 2:05
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    @Oddthinking This exact commercial about science experiment is not available on the internet but commercial about the product is available. Is it okay to add it? The product is not Aquaguard classic. It is Dr.Aquaguard RO +UV. It doesn't do the distillation either. It removes contaminants, restores minerals. My main question is not whether a purifier can restore minerals. The question is does it yield better results if watered with purified water. – Nog Shine Dec 20 '17 at 4:08
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    Something that hasn't been commented on but needs to be considered: What plant species was that? For example, there are plants like Drosera that should be watered with deionized or distilled water, other plants benefit from lime added via tap water. – Roland Dec 20 '17 at 12:50

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