Without starting a debate about salt mix brands, I've been using IO since day one of my reef tank. I've noticed it before with batches but this time it seems to be getting worse. Using a 55 gallon plastic barrel used for nothing but make up water and cleaned between uses and using ro/di with zero ppm output. The water is crystal clear until I mix the salt. Even after 12 hours of mixing with a power head there is an awful lot of sediment floating around in the water and a film on the top. The sediment is thick enough to make the water cloudy. I'm going to let it pump for another day and see if it clears up. Just wondering if anyone else experiences the same thing or am I just getting paranoid?