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These are effervescent descaling tablets sold in a 24-count pack. Each tablet dissolves in water to break down limescale and calcium deposits inside coffee makers, and the listing names Nespresso plus Braun, Breville, Cuisinart and De'Longhi machines. They are a consumable maintenance item rather than a cleaner for coffee oils, so they suit owners in hard-water areas who run a descale cycle every few months. The main trade-off against liquid descalers is that you must dissolve a tablet first and dose by water volume, and the pack lasts a long time.
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Lowest price we've seen: $15.99 on Nov 9 at Walmart. Tracked across 2 stores since Nov 9.
Ratings are positive overall, with buyers mainly reporting that the tablets dissolve well and do the descaling job. Feedback is limited, so there is little detail on long-term results or on machines with strict warranty terms.