Can you use trisodium phosphate (TSP) to kill weeds?

TSP is used as a cleaning agent.
I wouldn’t use it to kill weeds. Here’s an article from a reliable source, and the thing is, even if it does kill the weeds it could, potentially, cause harm to small animals, birds and, of course, do you really want this stuff in your soil and groundwater? Just pull the weeds and research other ways to use this compound or, better yet, take it somewhere to be safely disposed of.

https://medlineplus.gov/ency/article/002489.htm

Here’s another.

www.bobvila.com/articles/cleaning-with-tsp-trisodium-phosphate/#,V8OAtXY_BU

TSPs are used as cleaning agent, lubricant, food additive, stain remover and degreaser.

Googiki is your friend.
There’s a bit on there about it being an excellent mildew remover – if you’re near an area hit by sudden flooding Who isn’t? you might want to donate it, or make up the solution and donate that.

@ibstubro It never floods in my area.

Never say never, @Coloma.
The results could be catastrophic.

@ibstubro I live in the mountains, the only thing that could flood would be the river which is miles from me. Hard to flood when your at an elevation.

TSP is a stain remover? Wow, maybe I’ll try it that way.

@2davidc8 It might work say on oil stained concrete, or a garage floor, etc. It is often used to clean walls before painting to remove dirt and grease and grime.

Use vinegar and salt solution. I think it works better than Roundup. Be careful with the overspray as it will snuff out anything that grows.

@Cruiser Thanks for the link to Everyday Cheapskate!
I see that TSP also works as a degreaser. I’m going to try it next time I need to unclog my drains!
As for weeds, I like the vinegar + salt idea of @Cruiser.‘s
Thanks, jellies!

I used to use it as a cleaning agent in home brewing beer.