Great, simple product that does the job.

g. · September 22, 2015

(function() { P.when('cr-A', 'ready').execute(function(A) { if(typeof A.toggleExpanderAriaLabel === 'function') { A.toggleExpanderAriaLabel('review_text_read_more', 'Read more of this review', 'Read less of this review'); } }); })(); .review-text-read-more-expander:focus-visible { outline: 2px solid #2162a1; outline-offset: 2px; border-radius: 5px; } Fantastic, much cheaper than buying dedicated descaler products that often use citric acid anyway.Doesn't come with instructions but I just sort of scooped it into the kettle / washing machine / shower head until the fizzing stopped.For those interested, the chemical reaction with limescale (calcium carbonate, CaCO3) is 3CaCO3 + 2(C6H8O7) ---> Ca3(C6H5O7)2 + 3H2O + 3CO2.The bubbles produced are the CO2, so when the bubbling stops the chemical reaction has stopped and no more limescale is being broken down.It's best to use hot water as it speeds up the reaction.And of course make sure you give everything a good few rinses out afterwards or else you'll end up with very sour tea!

easy, inexpensive kettle descaler

B.l. · January 11, 2013

I use in conjunction with a 50p 'kettle protector' from Wilkinsons - 1 small teaspoon of citric acid in half a kettle of water once a week (leave for about 5 minutes, then rinse, obviously!) and the inside of the kettle stays pristine. Better than any proprietary brand of descaler I've found to date.

OK

D. · August 25, 2017

Bought this as a stain remover to get rid of tanin stains on China mugs Seems to work reasonably well, but I still had to scrub some mugs even after leaving them to soak with citric acid & hot water in them

Great for descaling kettles!

S. · February 12, 2013

I bought this after realising that the expensive descaling product that I favoured was just citric acid! So, I half filled the kettle with water and boiled it. Weighed out 75g/2.5oz of the citric acid and poured it into the kettle (it fizzed beautifully!), then after 30 minutes my kettle was gleaming again! I hasten to add that I did rinse, repeat and boil several times before using the kettle again.Its a great product at a fraction of the price of the branded stuff!

Perfect product for cleaning and descaling

J. · April 15, 2021

Bought this as proprietary brands charge a lot for a little product. Buying like this is far more economical and stores well. You just need to remember how much to use for kettle, shower head, etc. Would definitely recommend