Powdered Oxygen. Grotek Oxy-Cal is a time-released supply of calcium and oxygen for the soil. Oxygen is a life-line for all living organisms and is required by all plants throughout their life cycle for optimum growth.

Oxy-Cal increases the microbial activity to provide a strong, disease-resistant growth medium. This enables the plants to better absorb and use the available nutrients and water.

Directions for use

Mix thoroughly with soil at the following rates:

Gardens – Use 250 ml (8.75 oz.) per 100 sq. ft. or 20 kg per acre.

Potting Soil – Mix 9 grams (1 tsp) per 4 liters (1 gallon) of growing media or 4 Tbsp per cubic feet.