Your search for "Effervescent tablet" revealed the following:

Sale price £32.29 Regular price £40.00 Sale
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Sale price £96.39 Regular price £130.00 Sale
Sale price £87.29 Regular price £90.00 Sale
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Sale price £81.50 Regular price £130.00 Sale
Sale price £58.99 Regular price £90.00 Sale
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Sale price £78.21 Regular price £90.00 Sale