hi, i recently watched a episode where someone had a problem with a drain not draining completely because the pipe was level with the sink. luckily they had 3 drains to work with and one was lower. i have one sink and one drain and the pipe in the wall is at the same level as the sink drain so i have the same problem with it not draining all the way and leaving some water in the sink at all times. any idea on how to fix this?