Every week, the most important water parameters of my saltwater tank are measured, and approximately 15% of the tank’s content is refreshed. A good example of the plotter, which is part of the HMI, is the semi-automatic water change feature of the Poseidon app. Below is the plot screen: the red line represents the temperature in the sump, the blue line indicates the sump water level, and the orange line shows the flow rate of the supply pump. The water change process was initiated at approximately 10:30 AM and completed around 1:15 PM. The plotter is a standard feature of the HMI software.
