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Pretty pricey for what they are, but that's the nature of these. My one complaint here is really about the lack of clear instructions. I'm using both a Delonghi bean-to-cup coffee machine and their own brand descaler, but descaler tells me to look at my coffee machine manual about how much water to add to the descaler, and the coffee machine manual refers me back to the descaler instructions ! There's luckily (although you'll have to hunt for it) piece of text that suggests 100ml of water if there's no other specific instructions
Used on my coffee machine, improved working afterwards but I think is going to need second treatment / live in a hard water area and have problems with limescale. Individual treatment packs easy to use but expensive compared to bottle of descaler Glad I watched YouTube video before using though.