Ferrogranul-20 moss control mix

Hi all,
Can anyone help me how to mix this moss control powder in a 8l watering can for moss please? I was thinking 30grams to 8l watering can but maybe i'm completely wrong. I have a huge bag of the stuff.
Thanks in advance. Link below.
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Generally speaking most garden-related chemicals seem to be dosed at 5ml or 5g per litre.
Wisdom is not putting it in a fruit salad.
https://linja24.de/Ferrogranul-20-25kg_1
Warm water dissolves the iron better.