Response to After about 2 years of usage, the dial on my 25280-100 cannot be moved. The pool repairman who installed the unit said the chlorinator should be removed once a year and the dial assembly cleaned to clear out chlorine residue. I removed the unit but was unable to take out the dial assembly. The handle on the assembly is solid plastic with no apparent way to get it off. It is unlike the diagram that came with the unit, which shows a knockout plug and a screw holding the handle to the unit.

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