Hypertension is normally present as a child, but the condition can be detected later in life. Hypokalemia is a result of increased potassium secretion from the principal cells and alkalosis is the result of luminal electronegativity and increased exchange of H+ with K+ in the intercalated cells (Link to intercalated cells).
The treatment is sodium restriction and amiloride, which is a medication that blocks ENaC. Spironolactone will not have an effect as increase sodium reabsorption is independent of aldosterone.