Product Overview
Roebic FRK-6 Foaming Root Killer is designed to eliminate root problems in sanitary sewers and inhibit new root growth. Its patented formula foams upon contact with water, filling the entire pipeline with the active root-killing agent, dichlobenil. This product is recommended for recurring root issues and helps prevent costly clogs and backups.

Image: Front view of the Roebic FRK-6 Foaming Root Killer bottle.
Safety Information
WARNING: KEEP OUT OF REACH OF CHILDREN. CAUTION.
This product contains Dichlobenil, 2,6 Dichlorobenzonitrile. It is intended for use in toilets with septic systems, but is banned for use in septic systems in Florida due to state regulations. Always follow the application instructions and safety precautions printed on the product label.
First Aid:
- If in Eyes: Remove contact lenses if present. After the first 5 minutes, continue rinsing eyes thoroughly with soap and water for at least 15-20 minutes. Call a poison control center or doctor for treatment advice.
- If on Skin or Clothing: Wash thoroughly with soap and water after handling.
- If Swallowed: Call a poison control center or doctor immediately for treatment advice. Do not induce vomiting unless told to do so by a poison control center or doctor.
- If Inhaled: Move to fresh air. If not breathing, call 911 or an ambulance, then give artificial respiration, preferably mouth-to-mouth if possible. Call a poison control center or doctor for further treatment advice.
For emergencies, contact a poison control center immediately.
Preparation
Before applying Roebic FRK-6 Foaming Root Killer, it is crucial to ensure that any existing, established root blockages in your sewer line are physically cleared. This product is designed to inhibit new root growth, not to remove large, established root masses. Consult a professional plumber to snake or hydro-jet the main sewer line if significant root blockage is present.

Image: A cross-section of a pipe showing dense tree root intrusion, illustrating a common problem addressed by this product.
Usage Instructions
Follow these steps carefully for effective application:
- Pour Contents: Pour the entire contents of the 1-pound container of Roebic FRK-6 Foaming Root Killer into your toilet bowl.
- First Flush: Immediately flush the toilet once.
- Second Flush: As soon as the toilet stops running and the bowl refills, flush it a second time.
- Third Flush (if applicable): For low-flow, high-efficiency toilets (typically installed within the last 20 years), a third flush may be necessary to ensure all product is carried down the drain. For older, high-flow toilets, two flushes are usually sufficient.
- Restrict Water Usage: After the final flush, restrict all water usage in the entire home for 4 to 6 hours (or 6 to 8 hours as per some recommendations) to allow the product to work effectively in the pipes.
- Resume Normal Usage: After the recommended restriction period, you can resume normal water usage.

Image: Visual guide for applying the root killer, showing pouring into the toilet, flushing, and water restriction.
Video: A demonstration of applying Roebic Foaming Root Killer to a toilet, showing the foaming action and flushing process.
Maintenance Schedule
For ongoing prevention of root intrusion, apply Roebic FRK-6 Foaming Root Killer annually. Regular application helps maintain clear pipes and prevents new root growth from causing future blockages.
Troubleshooting
- Product Not Foaming or Working: Ensure the product has not been exposed to moisture, which can cause it to clump and reduce effectiveness. If the product appears moist or lumpy, it may not foam correctly.
- Continued Blockages After Application: This product inhibits new root growth. If significant root blockages persist, it indicates that established roots were not fully cleared prior to application. Professional snaking or hydro-jetting is required to remove existing root masses before this product can effectively prevent re-growth.
- Incorrect Flushing: Ensure the correct number of flushes for your toilet type (2 for high-flow, 3 for low-flow/high-efficiency) to ensure the product reaches the sewer line effectively.
Product Specifications
| Specification | Detail |
|---|---|
| Brand | Roebic |
| Model Number | FRK-1LB |
| Item Weight | 16 ounces (1 pound) |
| Liquid Volume | 1 Liters |
| Item Form | Granule |
| Active Ingredients | Dichlobenil, 2,6 Dichlorobenzonitrile |
| Usage | Toilet (for sanitary sewers) |
| Special Features | Prevents Clogs and Backups |
| Product Dimensions | 2.75 x 5 x 2.75 inches |
Warranty Information
This product comes with a standard manufacturer's warranty. For specific details regarding the warranty coverage and terms, please refer to the packaging or contact Roebic customer service directly.
Support
For further assistance, questions, or concerns regarding the Roebic FRK-6 Foaming Root Killer, please visit the official Roebic website or contact their customer support. Always refer to the product packaging for the most current contact information and detailed instructions.




