For the aeration test I did the following:Your outdoor aeration lest.
Also, that salt pH is still dependent on CO2 levels. So as it mixes and aerates, it will try to equilize with the CO2 in the air.
-Measured pH of 60 ml of sample water
-Took the main container of the water sample and areated outside for 1h open with air pump
-closed lid and left at room temp for 1h
-measured 60 ml of areated water