Robust & durable foraging feeder With the latest Biomaster Silver Ion Antimicrobial technology Effective at killing harmful bacteria. This robust & durable foraging pellet feeder is impregnated with the latest Biomaster Silver Ion, Antimicrobial technology, which is 99.9% effective at killing E-coli, Salmonella, Campylobacter & at least 50 other harmful bacteria. This protection is 100% active for the full life of the product.