Q. Is it safe to dispose dental X-Ray fixer and developer down the sink?
A. Silver-bearing wastes, including X-Ray fixer, should not be discharged to the sewer unless they are first treated in a properly sized, designed, installed, operated, maintained, and serviced standard silver recovery system. Otherwise, fixer should be taken off-site for treatment and disposal. Developer solutions should not be mixed with fixer solutions, and may only be discharged to the sewer if they have not mixed with fixer. If you are not connected to a sewer system, you should have your developer disposed of by a hazardous waste company. So, the short answer is if you are connected to a sewer, developer can be poured down the sink and if you have a silver recovery system, fixer can also be poured down a sink.