Ecam 23.450 S

Hello,
we own since December last year the ECAM 23.450.
We are also completely satisfied with the machine.Yesterday it was time to decalcify again and I was also asked again - after only a little more than a month and probably not as much coffee run as described in the manual - to replace the filter.Can the filters with you also not last 2 months?Find that in the long run quite nice in the money.
Use tap water so far simply, which is probably quite calciferous with us, however, have you experiences with it filtered water to use? Is that better for the machine and the filter more long-lived?
A few experience report or opinion/tip I would be happy!
I wish you a nice day!

Tip: Turn off the filter function, take out the filter, buy a britta water filter and all the other equipment in your kitchen will thank you for it and you save on the filters, because the original deloghi are not really cheap.

Greuss