SoCal,

Yeah, I tend to agree that sounds like scaling to me, too. Salt would be water soluble.

Do you have any thoughts as to why your CH is rising? Unless your fill water is higher than 450, or you're chlorinating with Cal Hypo, I can think of no reason.

Is the scaling increasing or could it be residual from the high pH days.

To my knowledge, a sequestrant may or may not keep the Ca in solution, but it should have never precipitated in the first place if your pH is in line.

A complete set of test results might yield some clue but, eventually, you must identify that source of Ca and eliminate it.