Thanks, im not in the US of A though. price of the 32oz bottle doesn't seem too bad. but with shipping and import taxes it wouldn't be worth it.
I have changed the ratio now and made the solution much stronger. i read on here about making the solution saturated with magnesium until it wouldn't dissolve anymore (thread below this one, thanks to grzbear). i didn't get that far but i added heaps more mag chloride to the already made solution.