Great price - may scratch chrome
We deal with serious hard water deposits on everything in kitchen and bathroom. The only thing that works are pumice stones like these. You go through them pretty fast though, so it's hard to pay $2 or $3 per stone. This was a nice option. Unfortunately, I've had some issues with it scratching chrome, even when the stone is wet. But I think it's fine on tub, toilet and tile.
Rating: 4 stars