Tokyo Electric Power Company is using a chemical they call “liquid glass” to try and stop the leak of highly radioactive water from Reactor 2 pit, at Fukushima Daiichi.

TEPCo thinks the leak is coming from pipes under the reactors. They injected liquid glass (sodium silicate) into the gravel under the pit for Reactor 2. At this point the water flow has actually decreased, but it’s not known for sure if it’s from the liquid glass or that the source is finally running dry.

TEPCo will also use silt barriers in the water, in front of Reactor 2’s water intake. Radiation is also leaking from the intake, and they hope the silt barriers will block the radiation from spreading in the ocean.