www.sam-turner.co.uk
Or salt, works well on weeds and moss
...and be careful that you're not putting salty water onto any plants that you don't want to harm...
Indeed.
Be careful with that on paving. It will leave an orange stain.
More accurately the chemicals might enter the soil and ground water where they might cause a miniscule amount of harm to some organism. The little bit of theoretically dangerous chemical that we apply to weeds on our paving will make absolutely no difference to life on Earth at all. It will, of course, cause harm to the weeds growing on the paving.
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