Calphos™ is a natural, untreated soft phosphate with colloidal clay containing valuable minor minerals in addition to phosphorus..
This is a great clay and it has a perfect amount of clean available phosphorus for organic growing.
We carry the micronized version which helps create better consistency of the product throughout the soil.
We also make a TOPDRESS KIT as well for your convenience.
SHIPPING IS INCLUDED WITH THE PRICES IN THE DROP DOWN MENU
1 cup per cubic foot as part of a complete nutrient and mineral program