Chlorine can be removed from the water via agitation. Chloramine cannot be removed from the water except though absorbtion using carbon filteration. Chloramine removers do NOT remove the chloramine but locks it up into a different chemical compound that is non toxic to fish. What happens is it then becomes fertalizer in your tank. You need to remove it using carbon before adding the water to your tank. When my water supplier switched from Chlorine to Chloramine, I added an AquaFX RO unit using the NHCL2 blaster and was so impressed with the unit I became an AquaFX dealer.