I've been buying pumice stone for toilet cleaning for many years - nothing else helps against mineral stains in hard water. They're less dense than some of the store bought ones I've used and they seem to wear off quicker, but they remove mineral stains about as well as the store bought ones I've used. My only complaint and the reason for a 4 star rating is that some of them arrived broken. Fragments and plugs less than a few inches long are worthless, so I didn't get the full amount - 20 whole - that I paid for.
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