On installation, your Harvey Water Softener™ will have been turned on. The inlet and outlet valves should be inline with the pipework and the bypass will be cutting across the pipe. The outlet, inlet and bypass should all be facing the same direction.
You can easily turn off your Harvey Water Softener by closing the outlet and inlet valves by about a quarter, then open the bypass valve with another quarter turn. The outlet, inlet and bypass should all be facing the same direction still. If your water softener is leaking, this is how you can turn it off.
Each install is different, so the setup of yours might differ slightly from the diagrams: