Multiple drains do reduce the risk somewhat but because of the pipe size and pump size, the velocity can be quite high at the drain. Many cities now require both dual drains and SVRS especially for spas because the drains are not very deep.

The jets can be accessed from inside the spa end of the pipe. A socket wrench is used to unscrew them. Sometimes debris gets trapped behind the jets so it is a good idea to remove them and run the spa to flush out anything that may be there.