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I need to run a drain line from a water softner to a sewer cleanout. The water softner and cleanout are located outside and right next to each other. The builder designed it so a water softner could be added later.

How should I run a drain line off the sewer line to the water softner? The sewer cleanout inside the green housing has a recessed 3" abs plug.

Something like a sanitary tee > p-trap > air gap > drain line.

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Something like a sanitary tee > p-trap > air gap > drain line.

Yup, that part's good. Thinking is sound.

The fact that you now have to run a vent line from that location to above the roofline (possibly further depending on window locations, lower story and upper story roofs, etc) or have a stinky sewer vent right there is less than ideal. I guess you could try an Air Admittance Valve / Mechanical Vent. I hate the things for lack of reliability, but it's a tradeoff in this situation.

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