I disagree that the Sulfate is negligible.
To raise the magnesium of 100 gallon of water from 1150ppm to 1250ppm you will need a full pound of Epsom Salt. This would raise Sulfate 400ppm. That's not terrible IMO
but I would just caution about doing that often or using any more. 400ppm is a significant rise in Sulfate.
If you tried to double that then I think an 800ppm rise would be unacceptable. Same goes for regularly dosing it. You're going to get an overdose of Sulfate fairly quickly.
Just an opinion of course.
Originally Posted by steve-s
Epsom salts will not harm the tank if used propely like any other supplimental addition.
I absolutely agree with this though. A small amount of Epsom salt is very beneficial. I just don't believe regular dosing or adding 4 pounds of it is proper use.