Knoxzy inhalation solution 3% - Pack containing 30 Vials of 4ml. Knoxzy Hypertonic 3% Inhalation Saline Solution: Comes with 30 vials of single-use pre-measured 4ml Preservative and additive-free sterile saline vials per container. Preservative Free. How To Use: Depending on the need, up to four vials per day can be used (with one vial per inhalation). Break off a unit-dose vial and open it by twisting off the top. Pour the solution into the nebulizer. Use your nebulizer according to the manufacturer’s instructions provided with the system.