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. – Jan Doggen 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 An ion-exchange? Given this is about india, with sometimes very dodgy water, the Q also needs to clearly define "what is/where are we getting the tap water?" Plants fed tap in 80s Bhopal waste water would have easily benefited from any form of 'purification', ion-exchanged US-tap for euhalophytes will surely not do good. Currently "pure water" = 100% distilled H2O? Maybe sth like "cleaned or filtered water"? Vid seems to rely on charcoal and UV. – LangLangC Dec 20 '17 at 2:26
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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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