[Non-Tech] Descaling for 1/3 of the price

Totally non-techy post ahead:

Most supermarket/shop descaling powders (the little sachets) work out at about £15/kg, given that all they contain (for the vast majority of them!) is citric acid, it works out a lot cheaper to just buy Citric Acid in bulk (Amazon link: 1kg Citric Acid for £5) and use exactly the same quantity.

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