In the original, the bold portion is highlighted in yellow.Chris' Coffee Service does not recommend descaling by the end user. Often times home descaling can cause more problems than it solves. Various home descaling agents can react to the minerals and foam over ruining electrical components. If the solution is too strong it can cause the chrome plating inside the group to flake off and get in the coffee or if it's too weak it can dislodge minerals and cause a blockage. For liability/warranty reasons we strongly discourage descaling and will not provide any instructions on the process. Please seek a qualified service technician to properly descale your machine.
I got in touch with Chris about this and found that he feels, if anything, even more strongly than the manual suggests. He warned me that descaler is "acid and it eats away at the metal." Rather than descaling, he recommends taking whatever steps are necessary to make sure nothing but soft water is used with the machine. As he put it: "Using hard water and having to descale your machine is like banging your car into things and having to keep taking it to the body shop. Learn how to be a better driver and you won't need to fix it."
This all makes a certain amount of sense to me, but I was under the impression--from years of reading knowledgeable posts here--that running Dezcal through a machine on a regular basis was standard procedure.
Can anyone advise me?