They don't fizz all the way

At first these seemed great. Great price for a lot of bath bombs. They smell good and arrived in perfect condition. The big problem is, they don't really dissolve fully. My daughter has used them a couple times now and about half way through of each being used, they stop fizzing and she's just left with a mushy ball of bath bomb left. We'll obviously still use them as we have a bunch left, but they are pretty disappointing.

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