Just as an interesting side note here. I have a bodum santos electric pot. I used descaler and it started leaking. Eventually the leak 'sealed up' again. Hence I won't descale it again I do not believe or will probably kiss it goodbye.
I remember our (very young) first house, had well water, they eventually hooked up to city water. It 'cleaned' everything out and all those old coated pipes, the deposits starting coming off and everythign started leaking etc. Appliances too.
Just keep in mind that if you start putting 'very clean' water into your stuff, it might have some unintended consequences. Also remember that filters generally take ALL the stuff out of the water, the good and the bad stuff. If it is 'clean' enough to absorb the already built on scale into itself when you put it in your pot, it can also absorb minerals in your body and flush them out too. Ultra clean water is not very tasty either, it's actually bland, if you can call water that. They do make cartridges that do inject some chemicals back into the water to make it tastier.
Just some random thoughts.
Aaron