This should be an indicator of the level of seriousness at which this grower subsides. MG so, I will assume bagseed. Assuming bagseed, its important to know bagseed is generally very hardy and should not be used to generalize what works with proper cannabis grows.
I want to start by saying "Evian water may not hurt..." and then talk about potential benefits of this pretty silly idea. But I cant do that, because factually, there is stuff in that water your plant at the very LEAST doesnt need and at the absolute worst, does not want. Notably, salts. Lots of it.
Lets pretend its not bad for your plants - as realistically its likely not the worst thing for your plants. But talking about it like it could serve as a sufficient cal/mag supplement? Im sorry, but if you are using Evian and not having cal/mag problems - I would be willing to bet you wouldnt have cal/mag problems with normal water. The dillution of that stuff is rather severe, and makes it seem extremely unlikely to me that it will have any positive effects.
Lastly and possibly most importantly is the actual chemical composition of the calcium and magnesium (and everything else in the bottle). Its important to know humans and plants take in nutrients in very different ways, and nutrients that can be absorbed by one are not neccesarily going to be absorbed by the other. For this reason, we arent dilluting our plant nutrients and feeding them to sick people. Likewise, feeding a plant "human food" is very likely to not do anything beneficial.
So in summary, the non-cal/mag components are potentially dangerous for your plants, the cal/mag doses are insignificant to your plant, and the cal/mag composition is completely irrelevant to your plant.
So no, I will keep feeding with real water.
Um tap water has very similar constituents to Evian water as a fact, Evian comes out a lot better in tests over some chemicals in tap water.
Many growers use mineral water to no harm and there is very little non salt calcium and magnesium available to plants, try find soluable organic calcium without it being in salt form, pretty hard.
This is just for growers who question there water and its cal/mag proportions.
I would need proof that what is in Evian actually hurts plants, seems a bit overstated here and it has a better chemical composition for cal/mag than any soft water from a tap so any growers in soft water areas would actually benifit from this change.
Hence the thread and as i understand 80ppm calcium and 26ppm magnesium per litre is quite a generous helping of calcium and magnesium for most plants so would need you to explain how this dissolved available calcium and magnesium would not be at a more than adequate level for all plant growth, if anything i would say that the levels in Evian are quite rich.
Anyway this is a situation in which maybe you could try a few bottles on one plant, post results here and we'll talk futher about it, i am happy to hear any negative points you have as i have only found positive things about Evian and did my homework first before posting this thread as well as used it myself for 14 plants at a cost of 9litres a week for two weeks now and shows no negative effects, in fact growth has doubled with it, i am living in a soft water area hence my tap water is below 50ppm, even below 40ppm.
Live in a country with some of the best tap and mineral water in the world, we dont need RO machines here neither get nasty chemicals in the water, why would i use Evian instead of my pristine tap water??? Because is has so little calcium and magnesium and am always deficient as well as finding it hard to identify a cal/mag deficiency in the first place without thinking up ferts or somthing that wont solve it.
Check the chart and grab some Evian, this thread is to answer a question not recomend growers only use Evian, its cal/mag orientated so help a dude out please. Peace