I had a heavy line of limescale/calcium in my pool that would not remove (I have tried chloroform and even muriatic acid). I have tried toilet pumice and it has given the best results but required a lot of washing. I figured I would need a ton for the entire pool so I got this package which was the most economical. These things are the best, they were way better at removing scale than toilet blocks and were able to remove scale completely without leaving anything behind.
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