4 years ago I needed surgery, I started with a stone 2.7cm stuck in the gallbladder neck, inflammation and wall thickening to 42mm. After 8 months flushing the US said stone free floating, wall back to normal 3 mm and no inflammation.
I have still the stone, but no symptoms since by flushing I got all the sludge and cholesterol stones out, so the stone has room to float around.
I just do maintenance flushes a few times a year.