So, I have recently purchased Red Sea Coral Pro salt on one of those massive pro bags. Every time I makeup new water for a water change, the new salt mix is cloudy. I've stirred it until my arm falls off; I put a 1200 gph pump in it while my ro/di has filled the container it's in. I've done both (manual and pump) at the same time. I continued the use of the pump for two hours after I stopped adding water (it takes my ro/di about two hours to fill the container. Heck, I've even let the freshly mixed water sit for days and the water is no longer cloudy, but I can see all the particulate sitting on the bottom of the container. If I stir it ... guess what? Bottom line: something is in this salt that does not dissolve. Anyone else notice this? I am about to dump this entire bag in the ocean and run out and buy different salt.