Calcium Soluble from The Soil Makers is a premium, 100% pulverized limestone calcium carbonate powder designed to lift calcium levels in hydroponic and soil systems—without adding magnesium.

• 38%;
• 95%;
• very low, making it ideal when soils are already high in magnesium;
• 97.0% passing at 100 mesh and 85% passing at 200 mesh, ensuring quick dispersion;
• fine, easy-to-dissolve powder suitable for soil mixes and hydroponic solutions;
• The Soil Makers — backed by hands-on soil science expertise.

Why this matters: calcium is essential for strong cell walls, robust nutrient transport, and steady plant development. With a high Ca content and minimal magnesium, Calcium Soluble provides a concentrated calcium boost without unintentionally altering the soil’s magnesium balance. This makes it a reliable choice when soils already contain adequate or high magnesium levels, where dolomitic lime could tilt the balance unfavorably.

Ideal use cases:

• Hydroponic systems needing a pure calcium source that won’t over-supply magnesium.
• Soil gardens and raised beds where magnesium is abundant and a calcium boost is required for fruiting crops, tomatoes, peppers, and leafy greens.
• Container gardening and potting mixes that call for a finely milled calcium carbonate amendment for steady calcium availability.

What sets Calcium Soluble apart: it delivers reliable calcium with high purity and a predictable dispersion profile, helping you maintain calcium levels where they matter most while avoiding magnesium-driven side effects. Trust The Soil Makers to provide mineral amendments that support healthy root development, strong stems, and better nutrient uptake across your indoor and outdoor growing environments.