4 kg

Calcium Peroxide as an amendment to your potting soil, the recommended rate  is: 9 grams/1 tbsp/15ml per 1 gallon of soil/4 liters. If you would like to mix larger quantities mix in 4tbs (60ml) per cubic foot, so approximately 16-20 tbs (240-300ml) per bale of Pro-Mix. Always wear a mask or respirator, gloves, and goggles…