Hygrogum Alginate 1 lb Bag. Fast Setting Elastic Dust Free Alginate, Mint flavor, Green color, Single 1 lb (500 gram) bag. Hydrogum was one of Zhermack's first alginates and is still one of the most popular in over 50 countries. This elastic and versatile alginate satisfies the many demands of daily clinical practice, whilst guaranteeing satisfactory results.