Achieves algae clean-up quickly and economically, from green to clean in 24 hours with no brushing. Guaranteed! Regular use of Yellow Out can also help reduce algaecide use that can stain pool surfaces. Run filter continuously for 24 hours after adding. Yellow Out should never be pre-mixed with chlorine or other chemicals, nor should it be added directly into skimmer basket or filter suction line. Dosage: 2 lbs. per 15,000 gallons of water. Dosage: 2 lbs per 15,000 gallons