Applied Biochemists Yellowtrine is an easy and effective way to remove yellow and mustard algae in pool, restoring your pool to its former beauty. Its quick-dissolving granular formula can be added directly to your pool without any messy pre-dissolving or mixing, and leaves no residues like inferior products. It is compatible with chlorine, bromine, saltwater, and ozone sanitizers. Best of all, Yellowtrine is made by Applied Biochemists, a leader in bio-based pool chemicals, allowing you to buy with confidence.