Actual spring water or gallon jugs of "spring water"? I have natural spring water and I abandoned even putting it through my 5 stage ro
unit because of what all was in it.
I switched to walmart and giant eagle brands of distilled water. The distilled has almost no tds
, where the spring was much higher. It tastes better because it has stuff in it, but you don't want that stuff in your aquarium. Pretty generalized, but good enough.