1900g OSMOCOTE CALMAG 10-0-0 5mgo 17 CaO Calcium mix in compost, Hydroponics
1900g CALMAG. and out of the coir with watering, but our granule slow release Calmag stays active in the coir for up to 5 months. Very suitable to use in combination with other Osmocotes and water soluble fertilizers.