You're Overthinking It

I recently moved into a new home and saw the above device on the side of the fridge. I had no idea what its purpose was, so I just let it sit there for a few weeks while we settled. After most of the more pressing work of moving was done, I took another look at this weird little thing that had been on the side of the fridge. On one side it has a GE logo and says SmartWaterTM.