To clear a vent do I flush it with a water hose or can I get access from the waste pipe behind the wall trap. I have a basement toilet that is gurgling and water is sepping out from the ring when there is a lot of activity in the house.. ie. I already had a back-up from the sewer and cleared it from the trap to the street, which showed the water flowing however I neglected to snake it from the basement toilet to the sewer. If it is not the vent then I need to proceed to work on clear the line from the toilet.