I use the Amazon Plug to control the pumps.
Simple, cheap, and efficient.
I have two pumps:
1. Main return pump on my basement. Pan World 100X, connected on Amazon Plug named "Main Pump".
2. Water change/Fill pump. Pan World 40, connected on Amazon Plug named "Water Change Pump".
When doing a water change:
* On Amazon Alexa App, turn off pump #1.
* Open the drain pipe valve, and close the Saltwater Brute valve pipe.
* Turn on pump #2 to throw water into the drain.
After the water goes to the level I need:
* Turn off pump #2.
* Close the drain valve pipe and open the Saltwater Brute pipe.
* Turn on pump #2 until the water reaches the level needed.
* Turn off pump #2.
* Turn on pump #1.
* Go play with my kids.
I can automate the valve opening/closing with solenoids - also plugged on Amazon Plug, then I could automate these steps in the app, by simply clicking on "10 gal water change" or "20 Gal Water change". It's just a matter to control the time the pump runs.
But I think you can go semi-automatic at a lower cost, and simply like this. You just need to do the plumbing in your saltwater mixing station on pump #2.
BarIzoN