before I got an auto-top off I drew a line on my sump that marked the high water level for when the sump was running. If you're always filling it back to that line, your salinity shouldn't be increasing, in fact your skimmer should slowly (in a big system, VERY slowly) decrease your salinity and it removes salt water and you replace it with fresh.
Tunze ATO systems are the best by leaps and bounds
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