Went away for a week, came back to 1.60 salinity...??

[Coralgurl]

Is your there a chance your ato was topped up with salt water? I had left a bottle of salt water by my tank after a water change and went away for a weekend. My daughter ended up refilling the ato reservoir with this bottle of salty water rather than ro water. She didn't know as I didn't tell her, luckily it was a 1/2 full 5 gallon jug, so not a huge impact. Any chance of something like this happening?