CalPhos® Soft Rock Phosphate — 50 lb. Standard Powder
CalPhos Standard Powder is the original CalPhos grade produced since the 1940s. Finely ground to the consistency of fine lime with 80% passing through a 200 mesh screen, it is a natural untreated soft rock phosphate with colloidal clay from Canton Mills. OMRI listed for organic production. Sold in a 50 lb. kraft paper bag.
Key Specifications
- Analysis: 0-3-0
- Available P2O5: 3%
- Total P2O5: 20%
- Calcium (Ca): 20%
- Form: Finely ground powder, 80% through 200 mesh
- Package: 50 lb. kraft paper bag
- Certification: OMRI listed for organic use
- Not acid forming — will not cake or harden
Granular vs. Powder
The standard powder is the original CalPhos grade — finely milled for fast incorporation into compost, soil blends, and fine applications. Choose powder for compost blending and fine incorporation; choose granular for broadcast spreading with less dust.
Applications
- Soil Amendment — Slow-release phosphorus and calcium for large-scale applications
- Organic Programs — OMRI listed, compatible with all organic production systems
- Compost — Add to compost piles to retain nitrogen and boost phosphorus
- Transplanting — Apply at planting for root establishment support
Available Sizes
- 1 lb. | 4 lb. | 20 lb. | 50 lb.
CalPhos POWDER 50 lb.
CalPhos POWDER 50 lb.
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