Can't you add a valve in front of the filter so you can shut off all the water to the house? The installer for my water softener did that for me so I can shut off all the water. There is also a valve on the softener so I can bypass it and let hard water enter the house. He also added a faucet in front of the softener so that I can attach a hose to fill buckets or water plants without using softened water.
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