From: Sylvia Tarin Brousseau I am a drug chemist for DOJ. We routinely use mortars, pestles, etc. in the course of our analysis. Is there a sink filter (carbon?) to catch residual compounds being washed down the drain? We do have a neutralization tank that does some filtering. We have chemists that are worried about drugs (pharm and otherwise) appearing in the food chain due to the waste water. Any insight appreciated.