It is forbidden to dump waste tea and medlar residue.

Please don't pour tea dregs into the sink. It is your responsibility and mine to keep the water pipes unblocked.

You can put a filter bucket with a strainer in the sewer of the teahouse and label it "Don't want to be scum", so you don't pour tea residue everywhere. There is a trash can next to it, a rice basket on the bucket, and the wall says: Please pour the tea here.