Agar media - What am I doing wrong?

[s1214215]

Hi Everyone

What am I doing wrong with my agar media? It contains charcoal, banana and coconut juice for sowing.

My problem is it is splitting I guess you would say. The charcoal is lumpy and sitts toward the bottom of the media when set. Shouldnt it be a evenly mixed? Will this matter much to the seed or with the nutrients be affected due to the stratification?

Why is it happening? Am I making the pressure cooker too hot or cooking it too long? I have tried a hot stove and at medium heat, for 15 mins to 25 mins. Still the same result. I dont have a guage on my pressure cooker.

I appreciate any advice.

Brett