Morton Ultra 27,000 Grain Water Softener (Model M27) , often identified by its part or reference numbers like
Q: What does "full" mean during startup? A: When first installed, the valve goes into a "full fill" mode where it pumps 3 gallons of water into the brine tank. This is automatic. Wait 2 hours before starting a regeneration. 40278 water softener full
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The system thinks there is plenty of salt, but underneath that hard crust, it’s actually an empty cavern. When the system adds water to make brine, the water level rises, but because there is no salt to dissolve, the water just sits there, eventually rising higher than it should. Morton Ultra 27,000 Grain Water Softener (Model M27)