The BISSELL® 2X Ultra Concentrated Multi-Allergen Advanced Formula is the most efficient and effective formula to help remove tiny allergen particles from carpet such as dust mite waste, pet and pollen allergen. The 2X Formula is concentrated to provide same great cleaning to remove soil and stains. The 2X Ultra Concentrated Formula comes in smaller bottles making it easier for consumers to use, and take up less shelf space. This formula has been laboratory tested and is safe to use in BISSELL®, Hoover®, Dirt Devil® and Rug Doctor® full size deep cleaning machines- even rental machines. This formula is earth friendly and contains biodegradable detergents. It contains no phosphates, dyes, optical brighteners or heavy metals. The Bottle is made from at least 25% post consumer recycled plastic and both the bottle and cap are recyclable. Smaller bottles mean less plastic wasted and fewer trucks used to ship the same amount of formula. This formula is recognized for safer chemistry by US EPA"s Design for the Environment (DfE) Program. User Tips: 2X ultra concentrated formulas provide the same great cleaning results with less formula. To ensure maximum cleaning performance, be sure to use the proper amount of formula. If you have a BISSELL full size deep cleaner with SmartMix®, add 1 cup (8oz.) of hot tap water to the solution tank and then add formula to the fill line. For other full size and rental machines, add 1-1/4 capfuls (2.5 fl oz) to each gallon of hot tap water. To speak with a product specialist regarding questions on any BISSELL product, please call 1-800-854-7366, Monday – Friday, between 8 am & 5 pm EDT.