Should all ro water read 7 when finish brewing. I have a four stage with DI as last stage. Anyone?
SHOULD PH OF RO WATER B 7.0?
- Thread starter keeperfish
- Start date
Yes, 7.0 is neutral and is what RO water should come out at. My RO/DI unit comes out exactly 7.0 with a TDS of 2.
Does your digital one have to be calibrated or is it supposed to auto calibrate? I know on my hanna meter there is a dial to calibrate it and you put the probe in a 7.0 calibration solution.
I have to disagree, at least under normal conditions. The second RO/DI water is exposed to the atmosphere, it will immediately absorb CO2 and will have a lower pH. It isn't uncommon for it to run somewhere in the 6s as a result. Don't worry about its pH--it won't really have an effect unless you add a ton at one time. My RO/DI never comes out at 7.0 (0 TDS, verified by several meters). Also, electronic meters cannot accurately test RO/DI water since they rely on conductivity themselves. Since RO/DI water is a poor conductor, the results won't be precise anyway.
The pH of RO/DI water is extremely difficult to measure accurately, as the pH measurement is dependent upon the transport of ions. If you have deionized water, there are not enough ions to get an accurate measurement. Standard protocols for measuring pH of deionized water includes adding a neutral salt such as potassium chloride in order to get an accurate measurement.
RO/DI water also has no buffering ability. As soon as you add your sea salt mix to it the water will quickly adjust to whatever the native pH of the sea salt mix is.
In other words, don't waste time worrying about the pH of your RO/DI water.
RO/DI water also has no buffering ability. As soon as you add your sea salt mix to it the water will quickly adjust to whatever the native pH of the sea salt mix is.
In other words, don't waste time worrying about the pH of your RO/DI water.