PH 8.8 after RO DI?????

[glenn10]

Setting up a new 46 gallon tank. Have not added anything to the water. I'm using an electronic PH pen that was calibrated to 7.0. Sink water from the well as 8.4.
After running the water thru a 5 stage RO,DI unit, the PH is 8.8.
What gives?

 

[slick]

How was it calibrated? Sounds like your pen is wrong.

 

[glenn10]

The Ph pen is by Shindengen that can be used for testing soil or water. I used a liquid to calibrate the pen to 7.0. The water that went thru RODI has been sitting in a container for 24 hours with no airation. Could the lack of airation be the problem?

 

[glenn10]

Looks like my meter is not working Properly. Distilled water is giving me reading of 7.7 to 8.4. Need to order a new one.

 

[sterling]

Glenn, I just had problems with my PH monitor. I was freaking out because my PH kept climbing. When it reach 8.8 I was fairly hysterical, took the meter down to check connections and noticed in small print on screen "low battery". Solved my problem with a new battery.