Belzer UW® Cold Storage Solution and ViaSpan Belzer UW® Cold Storage Solution Ingredient Hydroxyethyl starch (Pentafraction) Hydroxyethyl starch (Pentafraction) Lactobionic Acid (as Lactone) Lactobionic Acid (as Lactone) Potassium dihydrogen phosphate Potassium phosphate monobasic Magnesium sulfate heptahydrate Magnesium sulfate heptahydrate Raffinose pentahydrate Raffinose pentahydrate Total Glutathione Total Glutathione Potassium hydroxide* Sodium hydroxide/Hydrochloric acid (adjust to pH 7.4) Sodium hydroxide/Hydrochloric acid (adjust to pH 7.4) * Please note that while the g/L of potassium hydroxide for ViaSpan vs Belzer UW is different, the mmol/L is the same. This is due to the difference in concentration of potassium hydroxide used. Belzer UW® Cold Storage Solution does not require filtering before use or refrigerated routine storage. However, please note that the solution must be cooled to 2° to 6°C (36° to 43°F) prior to