pH of new water

[stephane]

Ok I just clean the probe who was looking like a piece of live rock calibrate (even after +3month the 4 years old probe is right on target)it and the value is 8.09 at 1.025 salinity

The difference in each is the make up water you take, I utilize ro/di water with a value of 0 tds
so this water is very easy to change PH. One drop of vinegar in the bucket will make 25 gallon of water acid and a pinch of backing soda will turned back hight PH

IMO That way I probably get the real value IO suppose to be :D