Using filtered water can make your coffee taste better if you’re not a particular fan of the taste of your tap water. It’s worth trying if you’ve got a filter jug to see what difference it makes. More importantly, a water filter should be installed and used where possible in a coffee machine’s water reservoir, particularly if you live in a hard water area. Using a water filter removes the impurities from your water, which can lead to better-tasting coffee. It also helps reduce limescale build-up, which will reduce problems with your coffee machine getting clogged up and requiring descaling. You’ll still need to regularly descale your machine (check it’s manual for the full details on how to do this), as a machine that has a lot of limescale in it will struggle to pour water at the right rate, and your coffee will be ruined.