Approximately 3 Month Term: Unical L 72 Ton Shell n Bone Builder 156 Ton 3. Product The products will be used as ingredients for feed at the ISU Kent Feed Mill and Grain Science Complex. Unical L – is large coarse particulate CaCO3 product with minimum calcium content of 38% Shell & Bone Builder – is a blend of coarse to medium particulate CaCO3, high calcium, slow solubility blend of hen and pullet-sized calcium carbonate, with minimum calcium content of 38%. ISU will consider other products that have the same feed qualities as the products listed. For alternate products, a Product Spec Sheet will need to be submitted for review. This can be submitted under the Response Attachments tab. Alternative products will need approval from ISU’s feed buyer.