Read on another thread:Don't think the problem was the Carto but i will try changing it. It was the same one that I used when i put the first tank full through it. Did not have problems with it until the 2nd tank load. Forgot to explain that in my first post. I am kinda new to cartos do you think maybe it was flooding because it needed cleaned???? ALso how are you going to change out a carto when the tank is 3/4 full of juice. Guess maybe You could syringe it out.
Take the new carto and place the fill end of the carto onto the threaded end of the old one. Push out the old one by pushing the new one in......end of story, very simple.....no need to drain the tank....