50# Calphos Soft Rock Phosphate (Organic)

(4 customer reviews)


SKU: GGRSS Category:


Calphos™ is a natural, untreated soft phosphate with colloidal clay containing valuable minor minerals in addition to phosphorus. It is not acid forming, will not cake or harden and spreads easily through any type of lime, phosphate or fertilizer spreader.

Calphos™ is not a complete fertilizer and should never be used as such. It is an excellent source of phosphate that is being used profitably for farmers who are interested in getting a dollar’s value for a dollar spent. When applied to the soil Calphos™ adheres to and becomes a part of the soil. It will not leach and it will not revert and once applied remains in the soil until used by the plants. Calphos™ contains no harmful acids and encourages growth of soil bacteria and earthworms.

Additional information

Weight 52 lbs
Dimensions 29 × 19 × 7 in



Granular, Powdered

4 reviews for 50# Calphos Soft Rock Phosphate (Organic)

  1. Mohamad K. (verified owner)

    This place is awesome. I wish I live in Portland area so I can get all my gardening supplies from there

  2. Andrew a. (verified owner)

    Great products, value and customer service

  3. Julie A (verified owner)

    Make own fertilizer this is used in combination with green sand and fish emulsion has always worked great, plants love it.

  4. Anonymous (verified owner)

    Not much to say yet. Fantastic shipping, arrived via freight to Western WA in days.

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