I dont use water filtering per se, but do use water softening.
Here in Perth, Adelaide also, and in the east to a lesser extent - the water is very hard and will deposit scale on the inside of your boiler. A water softener reduces this considerably (a normal under the sink filter does nothing to remove calcium salts).....
If you are using a normal domestic machine with a reservoir then a Brita filter will reduce the calcium (and lots of other nasties.... which may / may not improve the taste). If using a commercial machine then there are specific water softeners made for them..... and which should be used.
But the calcium salts - which produce the scale - are the ones to be removed to extend machine life.