Your search for "effervescent tablet" revealed the following:

Sale price £46.99 Regular price £50.00 Sale
On Sale from £169.50 Regular price £200.00 Sale
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Sale price £34.99 Regular price £50.00 Sale
Sale price £54.05 Regular price £70.00 Sale
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Sale price £39.99 Regular price £50.00 Sale
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Sale price £33.99 Regular price £40.00 Sale
On Sale from £38.99 Regular price £50.00 Sale