Stock solution: Biox WT 1 L plus 100 ml Biox WT Activator. Stock solution: Biox WT 5 L plus 500 ml Biox WT Activator. Stock solution: Biox WT 10 L plus 1 L (1000 ml) Biox WT Activator. Stock solution: Biox WT 25 L plus 2.5l (2500 ml) Biox WT Activator. Working solution: 1 Litre per 100 L water = 20 ppm concentration. Working solution: 1 Litre per 200 L water = 10 ppm Concentration. Working solution: 1 Litre per 250 L water = 8 ppm Concentration. Working solution: 1 Litre per 50 L water = 4 ppm Concentration. Working solution: 1 Litre per 1000 L water = 2 ppm solution.