Calmag Pro. By Plagron. 

When it comes to indoor growing, soft water and reverse osmosis systems are a bit of a double-edged sword. On one hand, they’re clean and predictable. On the other, they strip away crucial minerals your plants desperately need. Enter Plagron CalMag Pro, a no-nonsense, mineral-rich solution built specifically to address the invisible threat of calcium and magnesium deficiencies. Straight from the horticultural powerhouses at Plagron, this formula is less of a luxury and more of a survival kit for anyone serious about unlocking peak plant performance in low-mineral environments.

Peak Plant Performance. 

The formula itself is deeply intelligent. Plagron CalMag Pro delivers a precise calcium-to-magnesium ratio, fine-tuned to ensure that these two elements don't end up fighting for space in your nutrient solution. This is more important than it sounds. Calcium and magnesium are famously incompatible when delivered via certain compounds, particularly sulphates. But here, there’s none of that. Just pure, readily available nutrition in a form your plants can take up immediately. With an NPK of 5-0-0, it adds a solid nitrogen kick too, bolstering early growth while simultaneously laying the groundwork for cellular structure and chlorophyll development.

Especially for LED Growers.

Let’s be clear - Plagron CalMag Pro isn’t just for emergencies. While it will absolutely pull your plants back from the brink if you're seeing yellowing leaves, curling tips, or patchy growth, it's far more effective when used proactively. Indoor plants, especially those under high-efficiency LED lighting, often suffer from lower transpiration rates. This inhibits the natural uptake of calcium and magnesium. CalMag Pro corrects this imbalance, acting as a buffer against LED-induced deficiencies and ensuring that the plants get exactly what they need, when they need it.

For Vigorous Growth.

Then there's the root system. Healthy roots equal happy plants, and Plagron CalMag Pro is a root-strengthening powerhouse. Calcium reinforces the structure of the root cells, making them more resilient to stress and physical damage. Magnesium, on the other hand, fuels chlorophyll production, which is critical for photosynthesis. More chlorophyll means more energy, and more energy means more growth. It’s the difference between a plant merely surviving and one that grows with undeniable intent.

Super Concentrated. Lasts for Ages. 

One of the best things about Plagron CalMag Pro is its ease of integration. Whether you’re using a full nutrient schedule or just want to stabilise your base EC with RO or soft water, this is your go-to. It mixes easily, doesn’t clog lines, and won’t interfere with other additives in your feeding regime. You simply add 1ml per litre and go. Or, if you're setting your EC from scratch, dose until you hit 0.3–0.4 and build from there. It’s consistent, predictable, and works like clockwork.

Precision Nutrition for Soft or RO Water.

If you’re growing in soft water areas, or using RO water, or even just trying to extract the most from your plants under LED lights, Plagron CalMag Pro is absolutely essential. It’s not a flashy bottle of snake oil - it’s the product your plants wish you’d started using weeks ago. Available in four sizes, from hobbyist bottles to pro-level jugs, CalMag Pro scales effortlessly with your ambitions. It's one of those rare products that does exactly what it says on the tin - and then some.