An electrochemically activated water-based solution obtainable by electrolysis of brine-containing water in an electrolysis module (2) comprising a multitude of electrolysis cells (40) should have a particularly high bactericidal or antibacterial effect combined with particularly long storage stability, i.e. more particularly even after comparatively long storage for, for example, more than two years. According to the invention, such a solution is obtainable by electrolysis of brine-containing water in an electrolysis module comprising a multitude of electrolysis cells (40), in which each electrolysis cell (40) comprises a first electrode space assigned to a first electrical polarity and a second electrode space which is separated therefrom by a membrane (46) and to which a second electrical polarity has been assigned, wherein the electrolyte is supplied to the first electrode spaces (40) of the electrolysis cells serially in the manner of a series circuit.複数の電気分解セル（４０）を有する電気分解モジュール（２）中でブライン含有の水の電気分解により得られる水性の電気化学的に活性化された溶液は、特に高い貯蔵安定性で、つまり例えば２年を超える比較的長い貯蔵の後でも、特に高い殺菌作用又は抗菌作用を有する。本発明の場合に、この種の溶液は、複数の電気分解セル（４０）を有し、各電気分解セル（４０）はそれぞれ第１の電気的極性に属する第１の電極空間と、前記第１の電極空間と膜（４６）により隔てられた、第２の電気的極性に属する第２の電極空間とを有し、電解液が複数の電気分解セル（４０）の第１の電極空間に直列接続の形式で連続的に供給される、電気分解モジュール中でブライン含有の水の電気分解により得られる。
