I recently DIY-installed this water softener in my home (see picture,) but I don't particularly like what I had to do to get it installed.
The 18" corrugated stainless bendy lines each have 1 inch FIP fittings at the softener ends, and 3/4 inch FIP fittings at the plumbing loop ends. I don't particularly like how much I had to bend them to get them where they needed to go; they are almost kinked. I also don't like how far from the wall the water softener has to sit in order to keep them from getting kinked.
I think perhaps if I ordered 15" replacement lines I wouldn't have to hairpin-bend them like this quite so badly, but I also think that would put stress on the plastic (CPVC) nipples on the water softener.
UPDATE: Another reason I don't like this, is that I intended to also install a particulate filter on the supply side. But if I had, then I'd have needed to twist that corrugated line up like a crazy straw.
I am wondering if I could possibly redo this with some other combination of fittings and pex (or any other recommendations that make sense.)
Also: I didn't use thread dope on the CPVC fittings. I didn't know if I should or not. At the least, it is not leaking.