The System is the full filter care solution Kit comes with everything needed to clean Twin Air air filters in a sturdy storage box complete with carrying handles Kit includes: a Twin Air cleaning tub, oiling tub, BIO Dirt Remover (1L), BIO Liquid Power Filter Oil (1L), and multi-purpose contact cleaner (500ml aerosol) Cleaning tub is resealable and comes with a filter tray that allows dirt to sink to the bottom, away from filters Oiling tub allows filters to be submerged for easy, even oiling When not in use, the oiling tub is resealable, enabling users to save unused filter oil. TWIN AIR BIO SYSTEM