Warning! Potential Problem with Kent Salt.

[Beverly]

Maybe it's the mixing container (rubbermaid trashcan) that causes the problem, though when we used a glass aquarium years back, there was precipitation after a period of time, too. I think in a tank all kinds of chemical reactions happen with various components of the saltwater, and unless one chemical component is seriously out of whack, there won't be any precipitation.

Really, I don't know. I'm only guessing. But these have been my observations.

If we have leftover saltwater after a water change, we just dilute the leftover water more RO/DI water. Precipitation does not occur then.