... just generates less waste (sludge), the waste (Sludge) doesn't contains any oil, so it is no pollution for the ... low operation cost. During the regenerating process, you don't need add any other chemicals; The all process is under ... ,-- lubricating oil, hydralic oil regeneration,-- engine oil, motor oil, car oil, hydrualic oil recycling machine, oil decolorization, deacidification, dealkalizing.-- ...