WATERS IGL® Pulsatile Perfusion Solution is a clear to straw-colored solution for the in-vitro flushing and temporary continuous perfusion preservation of explanted kidneys. This solution is consistent with an extracellular solution, based on its sodium/potassium ratio. This solution has a calculated potassium concentration of 25 mEq/L, a sodium concentration of 100 mEq/L, an osmolarity of 300 mOsM, and a pH of 7.4 ±1.0 at room temperature.