Very helpful, thank you as always. Can you use three sensors to perform both ATO functions and Water change? For example, a high and low sensor for ATO to keep level, and a third sensor as the lower sensor for AWC? I'm using a MaxiDoser for ATO, but would prefer to use a less expensive submerged pump for water change. Of course, you could use 4 sensors, but the fact that ATO/AWC is an option suggests this is possible.