reef magnesium , epson as kalkwasser pickling lime?

[dadummy]

hello folks,
was looking at seachem magnesium addative, just overpriced epson salt? any other alternatives?
thanks for your time

 

[drew2005]

I just used the Kent Tech-M. I paid $9 for a 16oz bottle from my LFS. Worked great at raising my Mg. Noticed a slight increase in Ca also. Also had no effect on my pH.