In a setting where above average odors are constantly being created, the 2-gallon package is the answer to returning your home or locker room back to an odor free zone. At just $7.38 to refill your existing bottle, the gallon refill is the best economical choice, and, shipping is FREE. We have found that homes with an above average number of pets, teenagers, cooking and/or elderly who struggle with incontinence, greatly benefit from the 2 gallon package. The all natural formula is eco friendly and because it does not contain a scent, it holds no oil. This gives you the assurance knowing that no toxic chemicals are being sprayed into the air, around you, your pets, your plants or other people. Shelf life is 2 years from date of purchase.