Yellow Out is a chemical breakthrough! When used along with chlorine it dissolves mustard green brown or pink algae.Features: No brushing needed! Safe for all pool surfaces Safe for pools with salt generatorsSpecifications: Add 2lbs of Yellow Out per 15 000 gallons of water 2lb containerImportant: Never premix Yellow Out with chlorine or any other chemicals. Add product to the pool wait five minutes and add chlorine to the pool.