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Aztec Environmental Control
1983 Introduced the world's first self-cleaning colourimetric analyser.
Initially the analyser monitored residual coagulants such as iron and aluminium. Later the Aztec range was expanded to provide a suite of online analysis solutions including automatic coagulation control systems.
1991 Aztec Environmental Control was acquired by Severn Trent Water
Merged with Capitol Controls
Subsequently became Severn Trent Services Ltd.
2007 ABB acquired the Aztec range from Severn Trent Services.