There are several types of diuretics working in different parts of the kidney.
Thiazide diuretics inhibit sodium re-absorption at the beginning of the distal convoluted tubules. Loop diuretics prevent re-absorption of sodium and chloride ions in the Loop of Henle - portion of a nephron that leads from the proximal convoluted tubule to the distal convoluted tubule in the kidney. Potassium sparing diuretics prevent excessive loss of potassium at the distal convoluted tubules. Carbonic anhydrase diuretics inhibit transport of bicarbonate into the renal interstitium from the proximal convoluted tubule.
Natural diuretics include Parsley, Dandelion, Hawthorn, Hibiscus, Horsetail, tea.