I have an in ground pool with a  spillover jetted spa; Saltwater Pool and spa were installed in 2008,.  I add salt to my pool when needed. Filter cartridge is cleaned monthly.  Pool and spa are both crystal clear. Salt levels are stable at 3000-3200. Recently I began seeing large amounts of salt across the bottom of the jetted spa.  I am original owner and have not had this problem previously.  What gives? Suggestions/Directions more than welcomed.