Your search for "Effervescent tablet" revealed the following:

Sale price £69.64 Regular price £90.00 Sale
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Sale price £88.99 Regular price £90.00 Sale
Sale price £193.37 Regular price £300.00 Sale
Sale price £88.51 Regular price £130.00 Sale
On Sale from £22.99 Regular price £30.00 Sale
Sale price £89.99 Regular price £130.00 Sale
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Sale price £54.99 Regular price £70.00 Sale
Sale price £95.57 Regular price £130.00 Sale