Abandoned filtration system piping

[Bobk528]

Previous homeowner apparently had a now abandoned water filtration system in the garage. With a goal to clean up the garage by concealing wiring, conduits and pipes from sight and under the drywall or with a drywall soffit, a plumber was asked to remove the abandoned system. Attached are before and after photos. The pipe on the right goes out of the garage to a hose bibb and downward to the main shut-off valve. Uncertain where the two pipes going into the wall leads to but the kitchen is on the other side.

Two questions: 1) Is there a way to further simplify the piping configuration so the drywaller can figure out how to conceal it? and 2) after the plumber finished and left, we later found out that the dishwasher gets no water and the front lawn sprinkler gets no water while the rest of the house has hot and cold water. Is it related to the modifications?

 

[FishScreener]

Get rid of that loop. You have two lines that should have been tied directly together, with a tee up and out to the upper of the two on the left.

 

[breplum]

I have to disagree with FishScr's comment.
The original filtration pipe arrangement is normal and has the bypass valve, which is used when the filter is offline.
All that the new, low loop does is clean up and mimics the bypass.
The loop should not affect anything else because it is just a cold water supply feed to fixtures and typically never includes irrigation lines.
Though, there can be no guarantee that irrigation lines are not connected w/o investigating/tracing. But it would not cut off irrigation.