Translations:Water - Biosand Filter/36/en

• Approximately 3 liters of 12mm (1/2") washed gravel (drainage layer)
• Approximately 3 1/4 liters of 6mm (1/4") washed gravel (separating layer)
• Approximately 25 liters of washed 0.7mm (0.03 ) sand 40-80 liters (10-20 gallons) of water
• Chlorine