GPA Pure Organic Oyster Shells Powder
High-purity natural calcium carbonate (CaCO3 ≥ 95%) produced through mechanical cleaning, solar drying, and precision milling in Ada-Kasseh, Ghana.
Left: Fine milled 100-mesh powder sample. Right: Standard palletized 50kg export sacks.
Naturally Superior Biological Calcium
Unlike synthetic ground limestone (calcite rock), marine oyster shells are formed biochemically by living mollusks over years. The resulting aragonite crystal structure offers superior solubility in bird and animal digestive tracts.
Chemical & Physical Specifications
Typical analytical test parameters for GPA Pure Organic Oyster Shells Powder manufactured at our Ada-Kasseh plant.
| Test Parameter | Specification Limit |
|---|---|
| Calcium Carbonate (CaCO3) | ≥ 95.2% |
| Elemental Calcium (Ca) | 38.1% – 39.4% |
| Moisture Content | < 1.2% |
| Acid Insoluble Ash (Silica) | < 2.5% |
| Organic Marine Traces (Mg, P, Zn) | 0.8% – 1.4% |
| pH Value (10% aqueous slurry) | 8.2 – 8.6 |
| Chemical Additives / Bleach | 0.0% (Zero) |
| Origin & Harvest Area | Ada-Kasseh, Ghana |
Particle Size & Application Guide
Different livestock and agronomic use-cases require distinct granule distributions. We calibrate our industrial sieves to produce three core grades.
Grade A: Coarse Layer Grit
Texture: Crushed granular shell flakes
Sustained nighttime gizzard release for superior eggshell calcification and bone mineral retention.
Grade B: Fine Milled Powder
Texture: Uniform off-white mineral meal
Rapid homogeneous dispersion in mash feed mixers; immediate intestinal calcium absorption.
Grade C: Agricultural Liming Meal
Texture: Fine granular mineral grit
Gentle, non-caustic pH correction for acidic tropical soils without chemical burn.
Our 6-Step Manufacturing Process
How we transform raw coastal shells in Ada-Kasseh into consistent, pure, laboratory-grade calcium carbonate. Learn more about our Ada-Kasseh processing facility and local sourcing model.
Coastal Gathering
Generations of oyster harvesting around Ada-Kasseh leave clean shell mounds along the coastal banks. We gather selected shells directly from local communities.
Freshwater Desalting
Collected shells undergo thorough mechanical freshwater washing to eliminate sea salts, surface sand, and biological residues.
Elevated Sun-Drying
Washed shells are spread on elevated concrete drying tables under intense Ghanaian sunlight until moisture is verified below 1.5%.
Hammer-Milling
Heavy industrial pulverizers and hammer mills crush dried shells through calibrated perforated sieves into exact particle size profiles.
Vibratory Screening
Rotary classification screens separate the crushed material into distinct particle grades: Coarse Layer Grit and Fine Powder.
Heavy-Duty Sacking
Finished product is weighed and packed into 50kg woven polypropylene bags with moisture-resistant inner liners, palletized for dispatch.
Bulk Supply & Export Specifications
We service both domestic Ghanaian agricultural feed mills and international B2B purchasers across West Africa and overseas through Tema Port.
Ready to Place an Order?
Whether you need 50 bags for a local farm or 500 tonnes for a feed manufacturing facility, we provide prompt quotes.
Contact Our Sales OfficeFrequently Asked Questions
Everything you need to know about our organic calcium specifications, bulk ordering, and logistics.
What is the calcium carbonate (CaCO3) purity of GPA Oyster Shell Powder?
Our oyster shell powder tests at ≥ 95.2% pure calcium carbonate (38.1% to 39.4% elemental calcium) with less than 1.2% moisture content, making it an exceptional bioavailable mineral feed supplement.
Why choose oyster shell powder over mined limestone for poultry?
Oyster shell flakes dissolve slower in the bird's gizzard than mined limestone powder. This sustained release delivers continuous calcium throughout the nighttime hours when eggshell calcification primarily occurs, resulting in stronger eggshells and significantly fewer cracked eggs.
What mesh sizes and particle grades are available?
We provide three standard grades: Grade A Coarse Layer Grit (1.0mm - 3.5mm) for laying hens and snails; Grade B Fine Milled Powder (100 Mesh / <150µm) for mash feeds, premixes, and broilers; and Grade C Agricultural Liming Meal (0.5mm - 1.5mm) for soil pH neutralization.
What packaging options and supply capacities are available?
Our Ada-Kasseh milling plant maintains dependable production for local farm orders and multi-tonne commercial contracts. Standard packaging is heavy-duty 50kg branded woven polypropylene sacks with moisture barrier liners, with 1,000 kg jumbo bulk sacks also available.
Can you handle bulk commercial orders across Ghana and international export?
Yes. We deliver direct to commercial farms and feed mills across all 16 regions of Ghana. For international export, we facilitate full 20ft and 40ft containerized freight (FOB Tema Port) complete with phytosanitary certificates, SGS quality assay reports, and customs documentation.
How does oyster shell powder help snail farming (heliciculture)?
Snails (specifically the Giant African Snail, Achatina achatina) require massive amounts of natural calcium to construct and harden their shells. GPA Oyster Powder provides organic, bio-compatible calcium with zero chemical burn, preventing shell fragility, cannibalism, and mortality.