Monitoring of water systems with traditional methods can be difficult to accoplish if sample points locates far from each other. Online measurements makes it easier to see general state of water system. Automatic measurements monitor the state of the water 24/7 at the measurement point and notice also momentary changes in water quality. That makes it easy to gather information from multible sample points in real time regardless of physical locations of sample points. All collected data is send to internet-server, www.a-log.net, from where they can be viewed regardless of time and place.