I have a 9100SXT twin tank system and it ran out of salt a couple of months ago. After recharging, tank 2 is soft and working fine, but when the unit switches to tank 1, you can tell instantly and the water is not soft in the least. Anyone know what I need to look for or how to fix this? Unit seems to cycle fine on both tanks. You can see the brine draw functioning like it should, but tank 1 is never soft.