Hello All, New to this forum. I am in Quebec, Canada adn I wanted to know if there is a maximum number of 90 degree elbow one can install in a short distance ? I have a bathroom sink in my condo that is a really slow drain at times. I was wondering if it could be a venting issue or the p-trap position. I have attached a couple of photos. The installer also blocked access to the trap to clean out the trap. Thanks in advance for the help.