Yellow Out Pool Cleaner - 2lbsAmazing clean up results when used prior to shock treatment with an EPA registered chlorine that kills yellow algae. Dosage: 2 lbs. per 15,000 gallons of water Can be used with All Pool Surfaces Typical results occur within 24 hours Works well with salt chlorine generators Use 2 lbs of Yellow Out per 15,000 gallons of water prior to shock treatment with an EPA registered chlorine that kills yellow algae.