Calcium, Magnesium & Iron Supplement for Stronger, Greener Plants GreenPlanet Pro Cal is a concentrated calcium, magnesium, and iron supplement formulated to support healthy plant development, vibrant green foliage, and efficient nutrient uptake. Designed to complement virtually any nutrient programme, ProCal supplies three essential elements that play important roles in cell development, chlorophyll production, enzyme activity, and nutrient transport. Pro Cal is particularly valuable for coco coir cultivation and growers using RO or rainwater. In coco, its calcium and magnesium content helps manage cation exchange sites and correct substrate nutrient balance, making it an effective option for both routine supplementation and coco re-buffering. Key Features Concentrated calcium, magnesium, and iron supplement Supports healthy cell division and plant formation Promotes chlorophyll production and vibrant green foliage Assists nutrient transport and uptake Helps improve substrate cation exchange capacity (CEC) Ideal for coco coir cultivation Recommended when using RO or rainwater Helps correct nutrient balance within coco substrates Suitable for use alongside virtually any nutrient programme Can be used for coco re-buffering Benefits Supplies essential calcium for healthy plant structure and enzyme activation Provides magnesium to support chlorophyll production Delivers iron for chlorophyll formation and enzyme function Helps prevent common calcium and magnesium deficiencies Supports faster, more efficient nutrient uptake Helps displace excessive sodium and potassium from coco exchange sites Promotes healthier roots and vigorous plant development Maintains lush, healthy green foliage How Pro Cal Supports Coco Coir Coco coir contains negatively charged cation exchange sites that attract positively charged minerals. Elements such as potassium and sodium can accumulate on these sites and contribute to nutrient imbalances when present at excessive levels. Calcium and magnesium carry double-positive charges, allowing them to compete for these exchange sites and help restore a more desirable nutrient balance. ProCal therefore does more than simply supply additional Cal-Mag; it can also play an important role in buffering and maintaining coco coir substrates. Specifications Specification Details Brand GreenPlanet Nutrients Product ProCal Product Type Calcium, Magnesium & Iron Supplement Key Nutrients Calcium, Magnesium & Iron Standard Application Rate 1.25ml/L Coco Re-Buffering Rate 2ml/L Recommended For Coco Coir, RO Water & Rainwater Application Stage Growth & Flowering Compatible With Most Nutrient Programmes Application General Feeding Use ProCal at 1.25ml per litre with your regular nutrient programme. Continue applications throughout the growing cycle and discontinue approximately one week before harvest. Coco Coir Re-Buffering For re-buffering coco substrate, prepare a one-third-strength nutrient solution and add: 2ml ProCal per litre of solution. This helps replenish calcium and magnesium within the substrate and correct its nutrient balance before or during cultivation. RO & Rainwater ProCal is particularly useful when working with reverse osmosis or rainwater, where naturally occurring calcium and magnesium concentrations may be very low. Why Choose GreenPlanet Pro Cal? GreenPlanet ProCal combines calcium, magnesium, and iron in one easy-to-use supplement while providing additional benefits for coco-based cultivation. Its ability to support substrate buffering makes it particularly useful for growers who need more than a standard Cal-Mag supplement. From maintaining chlorophyll production and healthy foliage to supporting cell development and nutrient uptake, ProCal provides essential nutritional support throughout both vegetative growth and flowering. FAQs What is GreenPlanet Pro Cal used for? ProCal supplements calcium, magnesium, and iron while supporting healthy growth, chlorophyll production, nutrient uptake, and substrate balance. Is Pro Cal recommended for coco coir? Yes. ProCal is particularly useful in coco because calcium and magnesium can help occupy cation exchange sites and maintain a more balanced root-zone nutrient profile. Should I use Pro Cal with RO water? Yes. RO water contains very low mineral concentrations, so ProCal can help restore essential calcium and magnesium. How much Pro Cal should I use? For general feeding, use 1.25ml/L. For coco re-buffering, use 2ml/L with a one-third-strength nutrient solution. When should I stop using Pro Cal? For a standard feeding programme, discontinue ProCal approximately one week before harvest.
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