I think what you're doing is increasing or decreasing the "conductivity" as a whole. When it's the conductivity itself being modified, electrolyte content are also affected hence the increase and decrease of these electrolytes together with the conductivity.
With sodiium profiling, it's only sodium that gets elevated on the time period that the profiling is active. There is a peak, and a base. The peak is how high you want the sodium to be, for example 145 (as compared to the normal of 137 or 138). The base is the normal level you want the sodium to go back to after sodium profiling is done and automatically turned off (in most cases it's the default sodium level, 137 or 138). There is a time on how long the sodium profile is to be turned on depending on the program, namely STEP (recommended to turn off profile 30 mins prior to end of dialysis ), then Linear and Exponential (usually lasts the same time as the dialysis treatment time.)
On another note, current dialysis guidelines have gradually discouraged sodium profiling as studies have shown this led to increased thirst, and eventually increased fluid intake, therefore it was counterproductive. But it's not ruled out to be prohibited, it can be used ocassionally, one indication is for patients with chronically decreased serum sodium levels. It all goes down to the RN's and the MD's discretion.