Bluemec Cells turn water molecules into oxidants mixture, the process of which take place within water media (i.e. from water and into water). Ozone gas overflow is far less than 0.1ppm.
Corona generators turn oxygen gas into ozone gas. When air is applied, NOx by-product is unavoidable. To generate ozone water, circulation and gas diffusing process are necessary, leading to complicated setup. Overflown ozone gas is tricky.