Refill cartridges are recyclable. Last between 45 and 60 days. All of HYSO's fragrances are made from pure essential oils. HYSO fragrances are also synergistically formulated with Odoraxe™, a Malodor Technology scientifically designed and tested to effectively counteract unpleasant odors Odorizes up to 6000 sq ft of space. Green odor control at its very best. Environmentally friendly. No aerosols.