Was said: "If you think she doesn't like the acids in the sink" And I'm not saying anyone has done it, but it is a definite NO-NO. For municipal systems, it can destroy pipes, but worst upset the chemical process of the sewage treatment plant, or elements that they are not set up to handle are passed through into the environment. For small systems like for a house or small building, the chemical process also can be upset, the fluids pass through to your environment (maybe eat the fish from the downstream waterway),and solids get trucked to a municipal plant with the problems there.These people take in parts per million, or sometimes parts per billion. In our area, twice a year the local solid waste people have household hazardous chemical collection. They will take most anything, a hazardous waste disposal company is contracted that sorts, recycles, makes "lab pack" (combine materials that in themselves are hazardous, but after combined like an acid and an basic to neutralize both, or mix epoxies to make a stable solid) These guys are good chemists and have real fun! The residue is handled as hazardous waste and disposed in an approved way like incinerated or land filled. Some of the items that they get are pesticides,herbicides, cleaners, paints (at collection sometimes there are cans that people can sort through for a color they could use), and I have taken worn out etchant there. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist