So here is my auto water top off configuration for the aquarium, controlled by the GHL ProfiLux system.
The water is controlled by a solenoid valve seen in the photo, it is important to get these the right way round otherwise they will fail fast, note the red dot marks input.
The solenoid reacts to a low water signal from the optical sensor in the photo, the solenoid is plugged into controllable power bar which is programmed to react to the optical sensors state.
For added security should the solenoid fail open to stop fresh water being dumped constantly into the sump you will see a high level set float valve from Bubble Magus, we will be supplying these soon.
