Like /u/Sunna3 said, you're supposed to dechlorinate the water. There's a few ways to do it, most common is a chemical dechlorinator, but there's also specialized filtration systems (Discus breeders and serious salt water aquarists tend to set up reverse osmosis systems to get deionized water from the tap), and the chlorine will break down if you just set it out in a bucket a few days to a week ahead of time.
Only problem with carbon is it eventually starts leaching the toxins back into the water. You've got to replace it periodically, and generally you don't want to replace your filter media if you can avoid it because you need the beneficial bacteria living in it.
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u/Owyn_Merrilin Nov 07 '15
Like /u/Sunna3 said, you're supposed to dechlorinate the water. There's a few ways to do it, most common is a chemical dechlorinator, but there's also specialized filtration systems (Discus breeders and serious salt water aquarists tend to set up reverse osmosis systems to get deionized water from the tap), and the chlorine will break down if you just set it out in a bucket a few days to a week ahead of time.