Your search for "Effervescent tablet" revealed the following:

Sale price £17.99 Regular price £25.00 Sale
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Sale price £162.53 Regular price £200.00 Sale
Sale price £33.90 Regular price £40.00 Sale
Sale price £34.26 Regular price £50.00 Sale
Sale price £123.50 Regular price £150.00 Sale
Sale price £77.99 Regular price £90.00 Sale
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Sale price £99.49 Regular price £130.00 Sale