This may seem like a silly question, but how do I connect a shop vac to the filter system to blow out lines? I have seen the service company connect them somewhere near my pump and blow all the lines that way. I can't for the life of me figure out how they did it..
It seems that they were able to connect it to the pump somehow and then use the multiport and skimmer/main drain valve to change it to the returns, main drain or skimmer. I just can't figure out how they connected the shop vac.
Any advice would be very much appreciated!