Photo Chemicals Illegal in Garbage or Drains Hazardous Waste Fixer and Toners Are Hazardous Waste Used fixer and toners contain heavy metals (such as silver, gold and selenium) and should be disposed of as hazardous waste. Don't Dispose of in Septic System Do not dispose of photographic chemicals in a septic system. A septic system is an underground tank where waste is decomposed by anaerobic bacteria, essentially a smaller private sewer system. Only dispose of these chemicals on a sewer system, which sends wastewater through a treatment plant. Did You Know? A Literally Green Method for Printing Photographs Anthotypes is a green photography processing method that makes prints from flower petals, fruit peels and plant pigments. Find out how to make anthotypes.