Brain Heart Infusion Broth with 6.5% Sodium Chloride K 10. BHI with 6.5% Sodium Chloride is used to differentiate the enterococci (e.g., E. faecalis, E. faecium,E. durans, and E. avium) from the nonenterococcal species (S. bovis and S. equinus) by the 6.5%salt tolerance test.