Any water softener that uses Ion exchange resin and salt will remove/reduce dissolved minerals & metals in the water, and the list of what granulated activated carbon can remove/reduce goes well beyond what you will find in city water here in the USA.Do you have any before and after test results showing how well that system does at filtering and what it filters?
Keep in mind that you do not want a whole house system that makes ultra pure water for general purpose household use, that is money down the drain.

