PS 4/7 Bp OBC Mister Achieve a higher level of efficacy with the Kärcher PS 4/7 Bp OBC Mister. This hospital-grade spraying system is specifically designed for use with Vital Oxide® disinfectant. Reduce the risks of Health Care Acquired Infections by killing virus, bacteria and mold faster, safer and more effectively. PS 4/7 Electrostatic Sprayer NEW – our Electrostatic PS 4/7 sprayer adds the static charge to the particles to allow them to “wrap around” objects and provide even better coverage. Vital Oxide No rinse sanitizer for food contact surfaces (D2) and kills harmful bacteria, mold and mildew, deodorizes and eliminates allergens. Registered as a carpet disinfectant and recognized by CRI to be safe on carpets.