Waste » Business » X-Ray » X-Ray Developer
General Information
Unused developer cannot go down the drain because it contains hydroquinone, which is a toxic substance.However, hydroquinone is used up in the developing process, so used developer is non-hazardous and is safe to be disposed to sewer.
Be sure to keep used fixer and used developer separate. Check hoses in your x-ray machine to be sure they drain separately.
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Ecology's "Best Management Practices for Dentists"