What charcoal to use for springtail culture?

[enderbeanie]

I know theres many options of what types to use, but i plan on using lumpwood charcoal. how do you know which charcoal is safe for them? https://www.walmart.com/ip/Expert-G...ardwood-Charcoal-8-lbs/804132699?athbdg=L1300
would that one be safe for them? does the charcoal your getting just have to be lumpwood and 100% natural or is there other factors?

 

[egyptiancrow]

the one people use, is horticulture charcoal