Belgium Candy and other sugars.
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Coopers Carbonation Drops in 60's - 250g
£3.00

Particularly useful if bottling.
Carbonation Drops are a convenient, no fuss, no mess alternative to priming sugar.
They dissolve quickly without the need for inverting or shaking the bottle.
The dosage required is 1 drop per 375ml bottle or 2 drops per 750ml bottle.