BioBizz Calmag is 100% natural and contains the essential elements required for problem free and healthy plant growth – in all stages of plant development. BioBizz Calmag provides natural Calcium and magnesium which is vital for photosynthesis, plant cell production. Ensures the correct mineral concentration is present when using soft water or tap water. Working in sync with the BioBizz organic nutrient range BioBizz Calmag can be used with both hydroponics and substrate.