Spring water for growing plants?
 

Is is true that the quality of water effects the plant growth? If so, can spring water be used instead of tap water? which water grows plants much better?

It depends how you define 'quality'. In the UK at least many bottled 'spring' waters contain high levels of minerals. That might be a selling point for humans, but might not be great for plants that naturally live in mineral-low enviroments. Depending what your tap water is like, it might be better.

Processes which remove minerals produce purer water, which will be better for some plants, and produce a 'base' to which you can add the correct minerals for each plant. Eg de-ionised, reverse osmosis, distilled, rainwater (naturally distilled, but might contain pollution in some areas) and possibly filtered.

Not good: any process that add mineral salts in, including softened water (apparently some reverse osmosis systems re-add stuff as a final stage)

It also depends on the plant: most of mine do fine on my hard tap water. I just make sure to flush the pots on every watering so that minerals/salts don't build up. It's actually quite good for Paphs that naturally grow on limestone. I do get some de-ionised water for very sensitive plants, such as carnivores.

PS: nice try but no prize. I checked out the Samantha Springs website, and I don't see any listing of mineral contents, (except for being sodium free). Though I do notice that your water seems to be 'permitted as a public water system' and sold as an 'alternative to tap water'. I do love it when people sell water from one locality in another in fancy bottles! (Including coke bottles in this case...)

RG - the only "re-add" I've ever seen with RO systems is a calcite cartridge to stabilize the pH and improve the taste of the pure water for drinking or cooking. I suppose it might be OK to add calcium for plants, too, but my fertilizer does that....