Its calmag
GH is a product I don't recommend. It's owned by Scott's which develops products that cause cancer. Do some research on their product lines and make your own choice. Scott's is currently hurting the cannabis market with distribution tactics that raises question of the companies ethics. Research all products extensively and make your choice that is healthy for you and won't harm your community or local wildlife.
Your ethic values should be if the highest quality.....and your buds will follow suit.
Happy growing 2020