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Illegal Smile
Guest
You seem to be missing the point that tap water will hold a wrong pH just as much as it will a right one. Or rather, there is one pH it will hold and it might be the wrong one. Zero water is unbuffered by definition, we all know that. But it doesn't stay zero, it gets nutes added to it. Nutes that if they are good are designed with buffers at the right pH. But everyone should use what works for them and only those who aren't certain of that need to consider all the alternatives.From my experiences with fish tanks, the tap water will hold the pH longer then the RO water. Just think your RO cup is very low PPM water with acid in it, as soon as something acts with it, the pH will become unstable. The tap water cup that took a lot of pH down has all the minerals in it to "buffer" the acid and therefore will not fluctuate as much when other things are added. Take your RO cup for example, put one drop of an alkaline substance in it and watch that pH swing. Put the same drop in the tap water cup and it the pH won't do much. That should really show that nothing is "buffering" the RO water.
EX.. RO water 7.0 pH, add one drop pH down say you get 6.0 pH, now add one drop pH up and shouldn't you be back at 7.0 pH, basically canceling each other out? In the sense nothing is buffering the water it is free to change rapidly and is easily affected by outside influences.