The adherence of a certain pH value is important for the effectiveness of every water treatment. With the UVION treatment it is at 7.0, thus neutral.
UVION works with a pH dosage, which ensures that the water is neither acidic nor alkaline. In case of re-equipping a pool, which uses a not environmentally friendly water treatment, with the UVION treatment, a pH dosage might already exist.
For the products ECO and ECO2, the pH value has to be checked regularly by hand, since they are delivered without a pH dosage. The products ECO+, ECO+2, and ECO+2-130 come with a pH dosage, which automatically measures the pH value and keeps it at a stable value of 7.0.