... us one set of the 50g ozone generator, we will send you a free 7g ozone generator for air purifier. Welcome your inquiries ... 50g ozone generator Used in Large Water purifier, Water purification factory, Hospital disinfection, Industrial ozone machine, Sewage disposal facility, SPA and Hot tub ... transfer. After you pay us, we will send the products to you ASAP.The express method will be DHL,FEDEX,UPS ...