Introduction
This manual provides essential information for the installation, operation, and maintenance of your Pentair R171096 Rainbow 320 Automatic In-Line Chlorine/Bromine Feeder. This device is designed to maintain consistent water sanitation in pools and spas by automatically dispensing chlorine or bromine tablets.
Safety Information
Always read and follow all instructions carefully. Chemical feeders contain corrosive materials. Wear appropriate personal protective equipment, including eye protection and gloves, when handling chemicals and servicing the feeder. Keep out of reach of children. Ensure proper ventilation during installation and maintenance.
Setup
The Pentair R171096 Rainbow 320 feeder is designed for permanent installation in the return line of new or existing pools or spas. It comes standard with a 2-inch slip PVC fitting and adapters for 1-1/2 inch plumbing. No special venting is required for this unit.
- Installation: Install the feeder according to the provided instructions. If you are unsure about any step, it is recommended to seek professional assistance.
- Plumbing Connection: Ensure the feeder is securely connected to your pool or spa's plumbing system. Unions are not included and must be purchased separately if needed for your specific setup.

Image: The Pentair R171096 Rainbow 320 Automatic In-Line Chlorine/Bromine Feeder integrated into a typical pool plumbing system.
Operating Instructions
This feeder is designed to hold approximately 11 large or 98 small bromine or slow-dissolving trichlor tablets.
- Loading Tablets: Carefully load the feeder with the appropriate number of slow-dissolving trichlor or bromine tablets. Refer to your pool or spa's size and water volume for recommended dosage.
- Adjusting Flow: Adjust the control valve to regulate the chemical output. Start with a lower setting and gradually increase until the desired sanitizer level is achieved in your pool or spa water.

Image: Included accessories for installation and maintenance, such as the hose, PVC fittings, and silicone lubricant.
Maintenance
Regular monitoring and maintenance are crucial to ensure consistent water sanitation and a healthy swimming environment. Periodically check the tablet level and refill as needed. Inspect the feeder for any signs of wear or damage, especially the O-rings and seals. Apply silicone lubricant to O-rings to ensure a tight seal and ease of opening.
Troubleshooting
- Low Sanitizer Levels:
- Check tablet levels and refill if empty.
- Increase the setting on the control valve to allow more chemical flow.
- Ensure proper water circulation through the feeder.
- High Sanitizer Levels:
- Decrease the setting on the control valve.
- Ensure the feeder is not overfilled with tablets.
- Leaks:
- Inspect all connections and fittings for tightness.
- Check O-rings for damage or improper seating. Lubricate O-rings with silicone lubricant.
- Difficulty Opening Lid:
- Ensure the system pressure is off before attempting to open.
- Apply silicone lubricant to the lid O-ring.
- Consider using a specialized lid wrench if available for your model.
Specifications
| Brand | Pentair |
| Model Number | R171096 |
| Item Type Name | Rainbow 320 Automatic In-Line Chlorine/Bromine Feeder For Pool And Spa |
| Item Weight | 4.5 Pounds |
| Item Form | Tablet |
| Included Components | Automatic In-Line Chlorine/Bromine Feeder |
| UPC | 788379004385 |
Warranty Information
This Pentair R171096 Rainbow 320 Automatic In-Line Chlorine/Bromine Feeder comes with a 1-Year Manufacturer's Warranty. Please retain your proof of purchase for warranty claims. For detailed terms and conditions, refer to the warranty documentation included with your product or visit the official Pentair website.
Support
For technical assistance, replacement parts, or further inquiries, please contact Pentair Customer Support. You can find contact information on the official Pentair website or through the documentation provided with your product.
- Online Resources: Visit www.pentair.com for product manuals, FAQs, and support.
- Customer Service: Refer to your product packaging or the Pentair website for current contact numbers and hours of operation.