My water has chloramine in it and I am now using catalytic carbon in addition to activated carbon in separate chamber. It's been working so far but still do not have a definite answer on how long it lasts before needing replacement......prior to using catalytic carbon I was using a refillable cartridge with ammonia chips to treat ammonia from chloramine. I was needing to replace the ammonia chips monthly while so far this catalytic carbon has been going strong for 3 months now. I am using a 10 inch cartridge fyi.



