Swiss Espresso Decalcifier (2-bottle) by Durgol

Durgol is the only product recommended by the Delongi company.

This is the only product that my espresso machine manufacturer recommends and you need to utilize this when it tells you to or it voids the warranty.

I've never used this before, but it worked very fast and didn't stink my kitchen up like vinegar usually does. I would definately purchase this again.

We have a Capresso coffee maker and very hard water. This decalcifier works great. Our water has killed many coffee makers but we've had this one for over 2 years and it still works great.

I use this ridiculously expensive, no-ingredients-listed product because DeLonghi -- makers of my expresso machine -- recommend it.<br><br>But I have doubts it does more than a water-vinegar mixture would.