When the toilet paper comes into contact with water, the good microorganisms are activated, producing enzymes that feed on the offending organic matter present in the pipes and sewer system. These microorganisms reproduce exponentially and intensify their cleaning action even where it is not possible to intervene chemically or mechanically. Tissue Type: Toilet; Number of Plies: 2; Number of Sheets: 500/Roll; Length: 146 ft.