Reagent ACS grade water, for all standard pathology laboratory applications. Water is purified in-house in the StatLab state-of-the-art deionized water purification system. Incoming water is filtered and softened before it undergoes a reverse osmosis process. The water is further purified by UV, followed by an ultra-purification ion exchange process. The ultrapure water then gets sent through a very fine mesh filter. The DI water is constantly circulated through a closed loop system, preventing any chance of microorganism growth. Finally, in-line monitoring confirms consistent purity which is further validated quarterly by a third-party lab. Available in gallon, 2.5 gallon, and 5 gallon sizes. Gallons must be purchased in increments of 4.