Originally Posted by mr_X
if you aren't mixing large amounts (making 50 gallons of water at a time for a large system) of that caked up salt, you should consider throwing it away. it doesn't mix right once it's all clumped up like that.
It's an 80g tank, I only mix a little bit at a time to keep my SG
I've had the bucket for about a year, my sister in law gave it to me when I started the tank. She barely used any of it before tearing down her reef. It still mixes good, I swish with my mixer a few times and no particles are left unmixed. The Red Sea salt I had left all kinds of mess.