Response to Developing & Septic Tank

Kodak has a specific publication that deals with photochemicals and septic systems. They will send it to you for free if you call them. Among common photochemicals, the element of most concern for septic systems is residual silver. About 95% of residual silver is found in used fixer, with developer, stop and other chemicals containing much smaller amounts. "Pookie" is right that you should use your town or city's hazardous waste program to dispose of your waste. You may be able to reduce volume through evaporation so long as it is vented to the outside, but do not heat the chemicals. Lastly, you can reduce the toxicity of the waste you generate by using safer chemicals such as ascorbate based Kodak XTOL developer.

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