silica, and snow. Algae. Deep Ocean water filters up through geothermally heated layers of volcanic rock and bubbles up to the surface to create pools of some of the most unique water in the world. the pools are rich in silica and a unique breed of algae that not only gives the water the deep blue green color that makes it so iconic, they're also responsible for healing benefits promoted through the pools highly regarded clinics or health spas. the floor of some areas of the community pools are covered with a very fine gooey grey mud. squishes between your toes. mud like this is collected in buckets and basins for guests to make face masks. some advise, don't get it in your eyes, it sucks, especially if you;re wearing contacts. silica is fine, gritty and sharp stuff.