If you wanted complete ATO system, one that had the smart to tell you everything, you would want it to be like this.
1) Start delay low level. When the pump would start after the low level is detected.
2) How long should the whole process take from low level to turning the pump off.
3) How long should the pump run.
4) If level is still low, and the pump ran out of time.
5) Sensor should be optical, no float to stick.
6) Manual float valve, to protect from anything going bad.
7) How many times did ATO turn on in a 4 hour and 24 hour cycle. Saltwater and RO/Di water are compared.
8) If you wet skim, do a Conductivity check before ATO starts. Switch to saltwater instead of RO/Di water during ATO.
9) Minimum amount time ATO detection, optical stops working check.
10) Stop the ATO system and send a text alarm if anything above failed.
Yes this would be a a perfect ATO system and yes i have design one that does this. :thumbsup: