The last company I wanted to buy from guaranteed their
sustainable product... They were stripping mangroves to produce it.
If I may query:
Where is your sustainable source coming from?
Have you done any soil trials to check it has an effect. I have found types char most effective in specific soil types and not so in others. Have you?
What is the certification you speak of? What does it mean to me in terms of expectations of your product?
When do you weigh the char, after the kiln, or before shipping? The moisture content can change the weight dramatically.
This sounds like a good deal but I've been burned (yes it's a char pun) before.