Hi, In recent weeks I discover some tiny black particles floating in my kitchen facuet, after settle down for awhile the black dirts floating in the surface. After I clean the aerial spray screen but the black tiny particles still there. All other facuets in my house are all right. So I don't think it is come from the city water. Can you tell me what gors wrong and how to fix it. Thanks.

Steven from Oakville, Ont.