I've got an ET4 and an IC40. Yesterday I added a wireless control to the system. My salt ppm has been around 3800 (went higher after some evaporation, then I replaced it, it was down to 3750). As of last night, it was reading at 3750 on the remote. It rained a little last night and this morning. This morning, the pump wouldn't pull prime for about a half hour (until I heard it) and took care of it. Now when I check the salt via the remote, it's reading 4350ppm!!
Now, I'm kinda freaking out here but I haven't read it at the outdoor panel yet. Assuming it's the same, what in the world would make the salt PPM jump be 15% overnight with no loss of water??