Yes, bypass, unless you plan further treatment downstream.
Softeners are great for showering, but I wouldn't wash a car with one because of the ions it leaves in the water. You've got a higher potential to rust your vehicles out. It's a trade of calcium for sodium and chlorine. You can pull the chlorine out, but the sodium is much more difficult and just as corrosive.
If it were me, I'd throw a charcoal canister filter on it, depending on starting water quality, and go.
If you take a sample, PM me and I'll take a look at it.
"Pump one is on for the black Jeep"
"It's not a Jeep"