Containing a battery pack meltdown.

[400bird]

Water in a fire cuts oxygen
the 4 in LiFePO4 is next to oxygen.. which means there's 4 of them
the chemistry can burn under water.

In this case, the water is to cool down the area so the neighboring cells are less likely to catch fire.
You can't stop the already on fire cells, but you can try to stop it from spreading.

I'm pretty sure cooling and depriving oxygen is purpose of water on most fires, but I'm not a firefighter.

 

[gotbeans]

Thank you. Long time lurker, who’s getting serious now. I’d like to thank the forum for the infinite wisdom.

Here’s the video, the product they are attempting to sell looks very similar to perlite.

The first one they dump I was gonna say that's totally vermiculite (and then I saw it literally says that on the bottle LOL)
it's better for holding moisture.
Perlite better for adding air to your dirt..

Their stuff does look like perlite, there are tons of better videos on it.
It's some glass stuff but in the end is probably pretty similar to perlite in the ways it puts out fire.

I doubt their perfect circle shape does that much of a difference, that's the only main difference I see vs perlite