Pond Boss Forums GENERAL QUESTIONS Water chemistry Pond Issues - Scum?

Other things that can deter the scum are wave action, spraying the film with water (pressure hose), creating waves using a boat motor, rain events; all things that break the water's surface tension during warm/hot weather. Another thing to rid the film is spraying it with peroxygen carbonate (Green Clean, Phycomycin or Pak 27). These materials oxydize and break down the organics in and creating the film.