This unit looks OK. Don't try to fully ozonate olive oil with it.The directions say to only ozonate oils for 25 minutes. This will not give you very many ozonides in the oil. Fully ozonated oils should only be made with a generator using pure oxygen, not room air as a source gas. If room air is used, the oil will be contaminated with nitric acid by the end of the process.
This would be an OK water purifier.
Hope this helps,
Paul