Moved into new house last year to find sta-rite shallow well irrigation pump running continuously outdoors. I opened panel cover to find the well pump wired 240V and double tapped into the pool pump breakers.

I disconnected the well pump wires for safety concerns. Being there are no open breakers, is there any possibility of reconnecting the pump again and adding a manual power switch to ensure both pumps are not run simultaneously.

If not safe as I assume, could anyone recommend a safe, economical solution.(I would only use 2-3 times a week to water lawn)