Bio-active formula with odor-killing bacteria to digest holding tank liquids, paper, & solid waste. 1 Gallon Ko Kills Odor Holding Tank Treatment | Raritan 1PKOGAL Raritan K.O. Kills Odor bio-active treatment Breaks down and neutralizes odor-causing waste materials at the source A small amount of KO added to holding tank keeps boat odor-free between pump outs Works without the need for tissue digesters or boosters All natural to help preserve and protect the marine environment Non-toxi and non-caustic formula Contains no formaldehyde or alcohol 1 gallon container