have you flushed your RO membrane? there should be an outlet with a valve on it, f lush a bucket full of water out of it and it should clean up your membrane.

The DI cartridge is color changing, can you tell if it is exhausted?

Tim Marvin was the inital contact on that...

the web page for the AquaFX barracuda http://www.aquariumwaterfilters.com/