Let’s talk about water. You fill a glass from the tap. It looks clear, but your nose says, “Pool party!” That’s chlorine. Carbon filters are absolute bullies to chlorine.
Water Filtration Activated Carbon at Abigail Schardt blog
They rip it right out of the water. This is why filtered water tastes “cleaner” and “smoother.” It’s not your imagination. The filter is literally removing the chemical flavor your municipal water plant added to kill bacteria.
It also goes after other bad-tasting compounds. That metallic or bitter aftertaste? Gone. Your tea will finally taste like tea, not like the pipe it traveled through.