Recently I noticed my washtub backing up somewhat when the washer drains. The washer drains into a wall fitting but the tub and washing machine share the same drain. I made a note to snake the drain. Last night I found that my Culligan water treatment plant which has operated for ten years, caused flooding into the basement. The water came from what appears to be a breather valve placed at the highest point in the system. The system was going through a backflush procedure when this happened.
My home is eleven years old and has been relatively free of plumbing problems so I am thinking that these occurances, in close proximity to each other, may be related. As I am not a plumber, my first thought was that they are tied together via a common vent which services that side of the house. I’m thinking I need to go on the roof and if I can find nothing obvious, call my plumber. Any advice would be greatly appreciated. Am I completely off track?