So i can't use epsom brackish or can i use epsom brackish? and is marine saline and epsom saline duplicate? ...
Answers: They are not the same. If you are wondering which you would use as a plant supplement after the answer is Epsom salt. Sea brackish would harm your plants. Here is an article that will explain exactly how Epsom salt benefit plants.
http://www.thriftyfun.com/tf62825998.tip...
Good Luck
Don't know what you want to use if for--and the two salts are not equal.