Max Control Holding Tank Deodorant – Four (4) Pack of 8oz BottlesMax Control Advanced formaldehyde-free formula.  Long lasting treatment eliminates and controls holding tank odors by breaking down waste and toilet tissue. Features:4 ounces treats a 40 gallon holding tankFormaldehyde-Free FormulaEasy to use. See-through window stripe for measuring easeEight (8) oz. ContainerNew Item # 9108557759 *Sold by the four (4) PackWARNING: This product can expose you to chemicals including ARSENIC which is known to the State of California to cause cancer or other reproductive harm. For more information go to P65Warnings.ca.gov.This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.