City Softener Resources

S4 City Softener Instruction Manual

Signature 3 City Softener Instruction Manual

S4 City Softener Cut Sheet

City Water Softener Softener Videos

Water Softeners: Frequently Asked Questions

Before You Install a CSI Water Softener or Filter

CSI Water Softener Startup Procedure

Legacy View Bluetooth App for Metered Softener

Legacy View: App Features

Rebuilding a CSI Signature 3 Valve

Sig 3 Water Softener Brine Draw Troubleshooting

Sig 4 Series Control Valve Tear Down

Water Test Site

View your current water test status and the history of your previous tests.

Register Your Product

Register your CSI product to receive helpful product information, service updates, and support.

DROP - The Smart Water System

Looking for a fully connected WiFi system? Shop DROP

CSI Water Treatment

Committed to providing the water treatment industry’s highest quality and most innovative products—all designed, developed, tested, and assembled in Ashland, Ohio.