Depends on what's IN your water.
The water from my tap has chlorine and chloramines (those water reports the city mails out ARE actually good for something!). I plan on treating my water this time with campden tablets since I am sick and tired of using bottled water.
Unless you are using a RO system, a carbon filter system will not remove chloramines.
Before you invest in a filtration system, find out what's in your water, and perhaps even the pH/gh/kh of the water to figure out if it will impact what you're trying to brew. I seem to recall that in general, harder water is somewhat better for brewing than soft water.
Had an RO system for a while back when I was raising delicate freshwater aquarium fish. It used a LOT of waste water to make 1 gallon of RO water, and unless you use the runoff for laundry, cleaning, etc. it's really a big pain in the ass.
YMMV