I Take Half A 160-25mg Tab Of Valsartin HTZ .

I take half a 160-25mg tab of Valsartin HTZ . I am having low Potassium in blood tests and am up to four horse pill 20MEQ daily. When I go to get a blood draw this week and if the Potassium is still low, would a change from Valsartin HTZ to Micardis HTC be indicated for its notable Potassium sparing property? I also am taking 40 mg of Lasix daily and every other day taking 2.5mg Metolazone.