Increased sodium increases fluid retention and blood pressure
Diuretics reduce fluid through urination 
Water binds to sodium 
Diuretics remove excess sodium and water 
Diuretics prevent sodium reabsorption 
Table salt is 40% sodium by weight 
Diuretics can cause potassium loss
Water is the largest component of plasma 
Most diuretics cause low potassium (Hypokalemia) Hypo is a small clue
3 primary diuretic groups. Thiazide, loop, potassium
Thiazide is most common diuretic for high blood pressure
*Thiazide, loop, potassium sparing