Yep, calibrating solution, same stuff. You should use that to test your pH kit, make sure it's accurate. Your question was whether a reading of 6 was normal for RO water, right? I would say, no that's not normal, plain old water should be close to 7 pH, so maybe your pH kit is not reading correctly. Or am I totally off the mark, and your question wasn't about the pH of the RO water...?? :-P
ghengis Reviewed by ghengis on . ph problems I been getting sign of high ph so,i checked the run off with a ph test kit and the reading was at 7. so i bought a couple gallons of ro water and checked the ph and it reads around fivish 6.00,could this be right?So i watered it again and then checked the run off and it reads 6.5 with the ph test kit oh,the soil I use is fox farm ocean forest.Anyone familiar r/o water and ffof soil Rating: 5