 Hypotheses In this trial 4 weeks treatment with the drug Kaleorid, 750mg, 3 tablets 3 times daily, equivalent to 90 mmol potassium daily, is tested against 4 weeks treatment with placebo, 3 tablets 3 times daily in a crossover design. In the end of each treatment period tests are done to investigate components in the renin-angiotensin-aldosterone system and the sympathetic nervous system. 