I know what lime is used for, but why are you wanting to put it in your mix? Its not needed for cannabis, especially when grown in containers. It will create alkali conditions in your soil that you'll only be able to offset by giving it acidic water. If you use a good mix of perlite in your soil, you'll have good drainage and you'll be able to maintain proper ph just by giving it balanced water and plenty of it, so as to prevent sodium build-up and ph lock. I suspect this is the problem you may be having and are trying lime to offset it...I may be wrong.