Since I have a bunch of pets, I don't use any chemicals. Here are options. 1. Boiling water. I use 2 kettles a day. 2. Epsom salt followed by boiling water. 3. Vinegar or a vinegar/water solution. I have in a pump sprayer. Vinegar will kill anything it touches, so be careful.
This is the most effective all-natural weed killer DIY that we use. It's even been featured on Hometalk! Hope this helps! Hugs, Holly