If the drain line flows continuously or never stops, the piston might be jammed (usually from debris in the line). Flush the mains pipe before the softener.

Connect the "In" hose from the bypass kit to the inlet port on the HV3.

Professional installation is recommended by Culligan Harvey to maintain warranty and prevent leaks, but it is often cited as DIY-friendly for those with plumbing knowledge.

While there isn't a widely published critical review of the " Harvey HV3 Water Softener Installation Manual

Locate the directional arrows embossed on the back or side of the softener casing indicating and "Outlet" .