Is your MgCl retaining lots of moisture?

[hillegom]

Originally Posted by bkelly

my MgSo4 is fine its a bigger crystal than the MgCl maybe the Fauna Marine is a made up recipe with both, perhaps that helps keep it dry, think the ratio is 5:3. My MgCl is in an old IO bucket which has a gasket that i hammer shut, the bucket is 3/4 empty now that its a pile of slush , maybe all that extra air in there is allowing it to suck so much moisture, i think ill put it in a plastic bag then into the sealed bucket next batch.

I would check the gasket on that bucket. Salts are hygroscopic. (I think thats the word, absorbing water.) The air in the bucket cannot hold that much water to create slush. Try and find another bucket. However, its too late to save the crystals. But it would stop more water from being absorbed.