Week 20 - Visit 10 - Post-Titration visit 2: Subjects will return to the GCRC for an interval history, pill count, blood pressure check and basic metabolic pane, and CBC if indicated. If their BP, potassium and renal function permit, they will remain on the current dose of aliskiren. If their Hgb ≥ 11 mg/dl, they will be able to participate in the final study day.