Your search for "Effervescent tablet" revealed the following:

Sale price £26.95 Regular price £30.00 Sale
Sale price £82.99 Regular price £90.00 Sale
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Sale price £64.90 Regular price £90.00 Sale
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Sale price £40.80 Regular price £50.00 Sale
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Sale price £53.99 Regular price £70.00 Sale
Sale price £51.97 Regular price £70.00 Sale