I have never seen a patient or order that is 0 K. That will make pts complain of severe cramping and worst case scenario, dysrrhythmias. Nephrologist nowadays never use potassium free bath.
In our clinic the standard bath is 2K for patient who has stable potassium or within normal range.
1K bath for those who has >5.0 K+
3K bath for thosw who has
It doesnt mean if the pt has serum K+ of 3.0 and has a bath of 3K will not elevate the pt's serum K+, 3K bath is a very potent potassium and can increase pt's K+ immensely.