On Thu, 9 Jul 2020 00:42:23 -0700 (PDT),
wrote:

On eBay it advises 20ml per litre of water

Once we leave the EU can we have sodium chlorate back? I remember a
garden with four foot weeds and we applied NaClO3 and in less that two
hours it looked like the place had been napalmed.

No harmful residues.

I know this substance was previously used for malign purposes but my
understanding is that such persons now use different products instead.