We have a duel type kitchen sink with a garbage disposal on one side with the dishwasher drain hooked into the garbage disposal. The trap on this side is at the same level as the other side and both are t'ed into one main 3" drain in the wall. Several months ago we changed a cracked faucet with a new but cheaper tall plastic faucet with a built in pull out sprayer from Home Depot. All was well for the first several months but now the water or drain seems to smell very foul like sewer water. At someones suggestion I filled 3 glasses of water at different tempetures, took them in another room and the water did not smell. We disassembled and cleaned the garbage disposal without any improvement. Could the new faucet be at fault? Or any other suggestions. Thanks, ChuckO