Aquamedic Salt users?

[Delphinus]

Anyone using this? I bought a bucket for the heck of it since the param #'s advertised on the bucket seemed good.

But I've been battling a rapidly decreasing Mg # in my tanks and I finally found out why, I tested a batch of NSW and Mg is 900 (compared to the advertised 1200). So every weekly water change I'm pulling Mg down even more.

I'm gonna try shaking up the remainder of the bucket and see if my next batch comes out a little better but was wondering if anyone else has noticed this.