Disposable masks as well as respirators are meant for single use and may not be shared, washed or recycled. So if your mask or respirator gets damaged, dirty or if you have problems breathing with it on, it should be discarded and replaced with a new one. Surgical masks ought to have a filtration efficiency of 80 percent or higher, and N95 respirators needs to have a purification efficacy of 95 percent. https://www.emailmeform.com/builder/emf/produkt/oxybreath-pro-reviews