Title: NOT so heavy duty
Review: I purchased this to clean my pool tile, considering the fact that said HEAVY DUTY I felt it 10 of them would do the job.It falls apart the minute that you start working. One stone lasts a minute of scrubbing, not even... I can't say enough of how it just disintegrates. So definitively NOT cost effective. I bought one big stone at my pool service store, a block like 6" x 4" and it WAS actually heavy duty that I was able to do the whole pool and have left overs. With the 10 of these I bought I wasn't even able to finish the Jacuzzi trim :(
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