I need help ASAP! My kitchen sink drains the water really slow and then starts to clog up. Water will sit in the sink for about 1 hour. When I turn on the garbage disposal it will send the water to the other side. I have checked all the pipes undeneath. They are all clear. Someone said that it is the air vent for the garbage disposal. My kitchen sink is in the middle of the house. I have looked down and see water but unable to reach it with my snake. What about Liquid Fire? Anyone please help. Thank you