ONA (Odor Neutralizing Agent) products are designed using scientific principles of molecular bonding. Two odors can offset one another when they combine to form a bond. ONA's active ingredients come from a blend of 32 essential oils and plant-derived compounds that bond with and neutralize a wide array of odors. Fight odors in rooms up to 1500 square feet with the ONA Breeze treatment system (ONA Gel not included). When ONA Gel dries out, renew it with ONA Concentrate.