Water chemistry doesn't stay static once it leaves the tap — temperature, light exposure, and time can all shift pH and ORP readings between filtration and the moment a bottle reaches you.
A cold-chain approach keeps water at a consistently low temperature from the point of alkalization through packaging, which slows the gradual drift back toward neutral pH.
Bottling in light-blocking or UV-treated containers is a second common step, since prolonged light exposure can accelerate oxidation and erode negative ORP over time.
Batch testing at each stage — source, post-alkalization, and pre-seal — is how a facility confirms the numbers on the label still hold true by the time a bottle ships.
None of this is exotic technology; it's closer to the same principles used in cold-chain food logistics, just applied to preserving a water's mineral and antioxidant profile.