This device produces large amounts of ozone and is inexpensive. Delivery from China is surprisingly fast, albeit a few more weeks. Note the bare bone base, box, block and nothing else - it would be nice if they included a piece of paper with wiring instructions. My 120/120v appliance has green/red input wires - does it matter which wire is plugged into which side of the outlet? Revain's weird rating system --- was asked to rate "warmth", "transparency" and "thickness". I gave it 4 out of 5 due to the lack of wiring documentation.
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