Your search for "effervescent tablet" revealed the following:

Sale price £59.48 Regular price £70.00 Sale
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Sale price £91.70 Regular price £130.00 Sale
Sale price £29.40 Regular price £40.00 Sale
Sale price £58.99 Regular price £90.00 Sale
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Sale price £63.21 Regular price £90.00 Sale
Sale price £81.50 Regular price £130.00 Sale