WATERS IGL® Cold Storage Solution is a clear to light yellow, sterile, non-pyrogenic solution. The solution has an approximate calculated osmolarity of 320 mOsm, a sodium concentration of 29 mEq/l, a potassium concentration of 125 mEq/l, and a pH of approximately 7.4 at 20°C. Its ion composition is comparable with that of the intracellular milieu. It contains osmotically active substances such as hydroxyethyl starch that allows better and more effective flushing, and raffinose and lactobionate to reduce swelling or cells. ¹