I work in acutes. Patient had a K of 5.9 over night so the floor treated it. I drew a recheck level at the very start of the treatment, just to be sure the bath was appropriate for the new level. K was 5.1 so we did a 2k bath over 4 hour treatment, BFR 400. A couple hours post tx, the K was drawn again and it was 5.0. I drew a pre and post BUN with the treatment and the urea reduction rate was about 60%. So the patient had a good treatment. But why didn't the K go down?