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The filtered tap will likely be effective at softeneing the water and removing unwanted temporary hardness cleaning up the taste.
We use BWT filters at work, and I got one of their home jugs for about £30. Really cleans up the regular tap water which then goes in my kettle, makes my coffee taste much better than before.
Would also suggest temperature of the water would be something worth considering. Does it come out a few degrees below boiling from the work tap? And are you pouring off the kettle or letting it cool at home? And if so by how long?