RaceX, whats a R.O. going to do for water with a pH over 7 besides absolutely nothing ? And, by the way, a pH of 7 is neutral. Its neither acidic or alkiline. I know its not optimal for growing, but if your water has a pH of 7.0 it needs ZERO done to it unless you are using for growing.
And Dusto, do NOT buy ya a R.O. system bro thinkin its going to lower ya pH. Waste of ya hard earned bucks. It will lower your T.D.S. (sediment, minerals, etc) and remove any chlorine, but thats ALL! Only way to lower pH is to add acid to it, and unless you had a pH of 9 or above, I would not even consider it for household use. Just live with it that you need to use pH down for ya nute solution.
The pH scale is logarithmic and as a result, each whole pH value below 7 is ten times more acidic than the next higher value. For example, pH 4 is ten times more acidic than pH 5 and 100 times (10 times 10) more acidic than pH 6. The same holds true for pH values above 7, each of which is ten times more alkaline (another way to say basic) than the next lower whole value. For example, pH 10 is ten times more alkaline than pH 9 and 100 times (10 times 10) more alkaline than pH 8.
And I know what the "flip" I am talkin about GBud......LOL
If you cannot smoke it or eat it, why grow it ?