Bought New Kitchen Faucet 2 Years Ago, Water Pressure Good. Has Been Decreasing Water Pressure Last 6-8 Months. Had Same Problem With Older Faucet 2 Years Ago When I Replaced It. What Is The Problem?? Could There Be Some Kind Of Build-up? I Removed And Looked At Faucet Pipes/handles And They Look Ok. Any Suggestions?