Just finished installing new softener. Ran it thru its first regen. Everything seemed to work as expected except for the brine fill. It filled the tank 2/3 full. About 3" below the overflow line. This is a brand new Pentair 14x14 brine tank. It is my understanding it should fill 6-12" deep or so. There is no grate. Odd for a brand new tank. How do I check the safety valve/float etc?