Quote Originally Posted by aquarium
I adjust the water in a large trash can. Given a 35 gallon at a time working volume, is there a way to lower both calcium and especially magnesium?
I don't know of any other methods other than what was described in the earlier posts in this thread. For magnesium, I think that the water softener approach is much better than the precipitation method I suggested since precipitation is OK at removing calcium and is not as good for removing magnesium.

Richard