Does it have to be flushed? could i instead empty it down the bath? pipe with root isn't connected to the toilet. also is it effective for a hopper?

The instructions are loo focused and as such the powder is emptied in the loo and then it needs washing down the drain to where the roots are. I would be worried about putting it in a plastic bath and think it would be hard to get it down the plug hole. Re hopper surely it would be easier to just cut or pull the roots out.

Can this be used to clear roots from cast iron pipe

I tried it but don’t think it worked. However it may have been a faulty batch as it did not foam in the pipe.

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Roebic Laboratories FRK-1LB Roebic FRK Foaming Root Killer, 1-Pound, 1 lb, White

Roebic Laboratories FRK-1LB Roebic FRK Foaming Root Killer, 1-Pound, 1 lb, White

Product ID: 53462579

Details

Active ingredients
Dichlobenil 2
Brand
Roebic
Item form
Liquid
Item weight
454 g
Liquid volume
1 Litres

⏳Long-lasting, slow & steady action

🌿Kills roots & stops regrowth

🛠️Safe for all plumbing types

Description

🌿 Clear your pipes, not your schedule — root problems solved the smart way!

ROOT ANNIHILATOR - Foaming formula penetrates deep to clear and prevent root blockages.
TRUSTED PROVEN - Thousands of 5-star reviews confirm reliable, slow-release performance.
PLUMBING FRIENDLY - Engineered to protect all pipe materials while eliminating invasive roots.
ECO CONSCIOUS POWER - Targets roots effectively while minimizing harm to surrounding trees.
EFFORTLESS MAINTENANCE - Simple annual use keeps drains flowing without costly excavation.

Roebic FRK Foaming Root Killer is a 1-pound liquid treatment designed to eliminate and prevent root intrusion in plumbing systems. Safe for all pipe types and surrounding trees, it uses a foaming action with active ingredient Dichlobenil to deliver long-lasting root control. Ideal for annual maintenance, it offers a cost-effective alternative to costly pipe excavation, backed by thousands of positive reviews.

Specifications

ASIN	B000BQM5DS
Active Ingredients	Dichlobenil, 2,6 Dichlorobenzonitrile
Best Sellers Rank	69,900 in Garden ( See Top 100 in Garden ) 51 in Plant Root Stimulators 7,732 in Pest Control Products
Brand Name	Roebic
Coverage	non-selective broad spectrum coverage
Customer Reviews	4.2 4.2 out of 5 stars (7,772)
Global Trade Identification Number	00033051002778, 00033051051752
Item Form	Liquid
Item Type Name	Roebic FRK Foaming Root Killer, 1-Pound
Item Weight	454 g
Liquid Volume	1 Litres
Manufacturer	Roebic Laboratories
Model Number	FRK-1LB
Number of Packs	1
Part Number	FRK-1LB
UPC	033051051752
Unit Count	450.0 millilitre

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