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Buy carbon filters for reverse osmosis water systems, such as a chloramine removal filter or inline carbon filter.

There are different types of carbon filter for RO system use. The most common is the pre RO carbon filter, or carbon block filter, that removes impurities before the water goes into the RO membrane. The carbon block filter is often white with a diamond shaped mesh on the outside. You can purchase a standard unit, or one that will remove chloramine from water. An RO post carbon filter, a carbon filter for drinking water, is not usually used for aquarium applications.

Under normal use, a reverse osmosis carbon filter usually needs replacement every six months. Many aquarists use daylight savings time as a reminder for the twice yearly replacement.