What are the various ways to remove chlorine/chloramine from tap water?

Question

OK, I actually know how to remove chlorine, but I'd like to have the pros and cons of each method spelled out. I will post an answer and mark it as a community wiki. Please edit it with your input.

Answer 1

There are several ways that you can remove chlorination from your tap water before you brew with it. This topic should help you to choose which one is right for you.

Off-gassing

If you water contains only chlorine and not chloramine, you can let it sit for 24 hours and the chlorine will dissipate into the environment.

Pros:

• Free

Cons:

• Takes a long time
• Will not remove chloramine

Boiling

If you water contains only chlorine and not chloramine, you can drive the chlorine off by boiling the water for 15 minutes.

Pros:

• Faster than waiting for it to off-gas at room temperature

Cons:

• Requires a lot of energy and significant time to boil all of your water before you even start brewing.
• Will not remove chloramine

Filtration

A charcoal filter is designed to strip your tap water of chlorine and chloramine, block carbon filters are necessary for effective removal.

Pros:

• Fast, nearly as fast as your free-running tap
• Removes both chlorine and chloramine

Cons:

• Filters last roughly 2-6 months depending on water usage and cost between $5 and $30+ dollars to replace depending on the system.
• Some charcoal filters need to have water running through them for about 5-10 minutes before being used when replaced. This clears out any charcoal dust that may have been generated during shipment.

Chemical Adjustment

Chlorine and chloramine can be removed from your water by dissolving potassium metabisulfite into it. One campden tablet is enough to dechlorinate 20 gallons of tap water.

Pros:

• Very fast - as soon as the K-meta is dissolved in the water and stirred, the water is dechlorinated.
• Removes both chlorine and chloramine

Cons:

• Powdered potassium metabisulfite smells harsh. If you catch a whiff of the powder when measuring it out, it stings the nostrils not unlike sex panther.

Answer 2

Are you quite sure you need to boil the water for 15mins? Im sure if you just boil your tap water in the normal way, for tea etc, then a rapid 3min boil is more than sufficient to rid the water completely of Chlorine!