We are currently building an in ground pool with a 24”wall along the backside that has a 3ft wide waterfall. The plumbing (pvc pipe) for the water feature is located behind the 24” wall. The wall was built using rebar and gunite. I think it looks tacky that the plumbing was not run inside the wall. How common is this? I am in California so weather is not an issue. My pool builder says it’s normal and you won’t see because behind the wall where the plumbing is located will be a planter with plants and soil. In any case it bothers me because I know it’s there and exposed for the world to see.