Biolab 23502 Swimming Pool Cleaner, 2 LbsYellow Gone is a chemical breakthrough! Amazing cleanup results when used prior to an EPA Registered chlorine that kills, green, yellow, pink and brown algae. Highlights: Size: 2 Lb For swimming pools NO Brushing Needed NO Metals Safe for all pool surfaces including vinyl Works well with salt water generation systems Patent Protected Yellow gone dissolves mustard, green, brown or pink algae.