Oblitiroot is a two part foaming root killer. One part is acidic and one part basic (the basic part containing the active ingredient). The two parts are mixed together in a toilet bowl or bucket. When they're mixed the two different parts create a chemical reaction that releases gas. The gas is trapped into making foam. This may sound familiar from the baking soda and vinegar volcanoes. The basic idea being the same, Oblitiroot has an herbicidal component and sticking components to maximize effectiveness.
Oblitiroot's foam carries the active ingredient through the sewer pipe to the roots. The foam is carried down the pipe with water. The foam rides the water to the root intrusions where the foam sticks to the roots to kill them. Oblitiroot also resists wash off from pipe surfaces and roots to prevent regrowth.
This foam has a relatively high concentration of Dichlobenil. Dichlobenil serves to stop cell division in plants which kills roots and stops growth wherever it is present. It is a non-systemic killer (it is not absorbed into the plant's system) so it does not harm the tree. Dichlobenil is a vapor killer. So wherever the vapor is present the roots will be killed and new growth will be prevented (for example, if you have a high concentration at one place in the pipe the vapor can still travel down the pipe and kill roots at another location).
There are 4 critical elements to having an effective long-term root killer.
Oblitiroot is a foaming root killer. The foam servers to carry the active ingredient - Dichlobenil - to the roots. When it sticks to the roots, the active ingredient goes to work and kills them.
The active ingredient must remain present in the line to be effective. Most of a foaming root killer can drain away during the application. Everything that drains away is essentially wasted. Oblitiroot is built to stick to woody tissues and prevent draining away. them.
Not only does Oblitiroot stick to roots. It also leaves a thin film on the pipe surfaces. The roots are kept out everywhere near the film barrier than remain in the pipe.
Oblitiroot's root killing film is specially formulated to resist wash off. This leaves a root proof barrier in the pipe as long as possible.
Dichlobenil is an environmentally friendly active ingredient. Part of that is because Dichlobenil is highly susceptible to microbial decay in sewer treatment plants.
This is desirable to keep Dichlobenil safe for the environment. Unfortunately, in sewer lines this decay is undesirable. However...
Microscopically Oblitiroot shelters the Dichlobenil from microbial decay and helps prevent microbial decay in the sewer line while keeping it safe for water treatment plants.