Off topic, but granite? May want to get an air quality monitor that can detect radon. Levels fluctuate with the weather—my off the shelf test only came back 0.7, but I didn’t trust it could always be that low (we have a lot of granite too). Airthings sensor put it at around 4-5 average, with lows less than 1 and periodically could get as high as 6.

Apparently no cover water, and was like that for a bit, so I’m thinking the bread knife might be the way to go in this instance.