QUARANTINING PLANTS
Not only can new fish carry bacteria and parasites on them, but so can new water plants you introduce to your pond. We therefore encourage you to always quarantine your new water plants. By using potassium permanganate you can ensure that most parasites/nasty bacteria will be killed.
Dip your new plants into a bucket with p/p and leave for at least 4hrs in the water before adding them to your pond.
Do not quarantine the plants in water with a high salt content. (No more than 1% concentration)

HI. To what ratio do i use the potasium to quarantine the plants?

I normally add a teaspoon or two in a bucket of 30 liters and leave the plants in there for an hour. I also add dimmilin because Potassium does not kill leaches and lice.