Gemnique Water Beads, Purple 15g Package - Just add water to make 1/2 Gallon (8 cups) of Water Gel Beads Non-Toxic, Fade Resistant, Re-Usable and Biodegradable Add one package (15g) of water beads to 12 cups of water, let set for 4-6 hours, drain and use HINT: Use 1 gallon of Distilled Water to make 50-percent larger beads (12 cups or 3/4 gallon of beads) When hydrated these water pearls are approximately 1/2 inch in size