jdmerc wrote:oh that makes more sense then. Thank you very much!
But the wiki says exact the same.
Do not scary me that there is something wrong

On your raise just remember the formula:
10% of the difference between Pot Purity and Humus Purity will go to the pot, but max. 2%.
Means:
If you have a 0% Pot and 20% Humus, the difference is 20%, then your pot will raise 2%.
But if you have a 10% Pot and 20% Humus, the difference is only 10%, so your pot will raise 1%.
If you have a 0% Pot and 30% Humus, the difference is 30%, but the Pot will raise still only the max 2%.