Derma Sciences Algicell® Ag Impreg Cal Alginate, 1.4% silver, provides superior bactericidal action that goes to work almost immediately. With its sophisticated ionic transfer technology, the dressing provides an effective barrier to bacterial penetration, and protects the wound against bacterial colonization. Algicell® Ag Calcium Alginate Dressing with Antimicrobial Silver. Can be used to reduce the risk of infection in moderately to heavily exuding wounds that include: Diabetic foot ulcers, Leg ulcers (venous stasis ulcers, arterial ulcers and leg ulcers of mixed etiology), Pressure ulcers/sores (partial and full thickness).