Orb-3® Y240-001-15G 15 gal Spa Enzymes Non-Foaming Drum. Orb-3 Spa Enzymes augments the natural decomposition of organic materials in spas while it helps stabilize pH levels. This helps reduce skin & eye irritation, keep spa filters cleaner, decrease unpleasant chemical odors and control scum lines. It is compatible with whatever chemical spa treatments you might use and reduces the need for using excessive amounts of chemicals. Its natural cleansing action washes away algae and slime, enabling conventional sanitizers to work more effectively.