"Worth every penny"
This might appear expensive, but it works faster, and more efficiently, than any other descaler I've bought. We have very hard water and the kettle continually needs to be descaled. This does the job in about 10 minutes. I even managed to remove months worth of hard lime scale build-up on the outside of the kettle by using it neat as per instructions. It doesn't leave that nasty odour that many such products have and, after one rinse, the kettle is fit for purpose. I wouldn't use anything else now.