2 Answers

Yes it does. This is what it removes:

Calcium
Calcium is found in water naturally, due to exposure that occurs between the water supply and the earth's crust. The concentration of calcium varies greatly, depending on where the water supply originates. Well water generally has much higher concentrations of calcium, which can negatively affect taste. Calcium can also cause scales to form on water jugs over time. Brita filters safely remove calcium from the water as it runs through the filter, improving the water's taste and texture.

Magnesium
Magnesium, another mineral commonly found in water supplies, contributes greatly to water hardness, which is the amount of alkali earth ions in the water. Magnesium is frequently washed off rocks, then absorbed into water supplies. Magnesium is present in many other minerals as well as fertilizers. Excess fertilizer often runs off into local water supplies, distributing magnesium into the water. While magnesium is not toxic unless doses are extremely high, Brita filters remove magnesium from drinking water, improving taste.

Chlorine
Chlorine is purposely placed into water supplies because of its disinfectant properties. Because chlorine is toxic to germs and bacteria, it is used to kill microorganisms before drinking water can be ingested. Chlorine is also toxic to humans in high doses. Breathing in chlorine can cause respiratory problems, coughing and difficulty breathing. Although it is rare for a chlorine concentration to be that high in drinking water, Brita filters do eliminate chlorine from the water after the water has already been disinfected, giving you the best of both worlds.

Lead
Lead is lethal when people are exposed to it over time. Long-term lead exposure leads to problems with the kidneys, nervous system and the brain, children and pregnant women being the most vulnerable. Lead is frequently a problem in older homes, which often have lead pipes. The lead comes off the pipes and is absorbed into the drinking water. Faucets can also be a source of lead contamination since chrome-plated faucets can contain up to 8 percent lead. Brita filters pull the lead out through the filtration process.

Read more: What Does a Brita Water Filter Remove? | eHow.com http://www.ehow.com/info_8033348_brita-water-filter-remove.html#ixzz27VGXrQwW

Brita filters partially removes calcium and magnesium inos, and, therefore, partially removes hardness of water.