5017 q?

The pump cannot be disassembled and in general you have to expect a shorter life if used in kalkwasser, usually 12-24 months and the longer end will be more likely if the pump is suspended in such a way that it cannot take in powder. You could periodically soak it in vinegar and water but this likely won't help much as the issue is the destruction of the oring seals inside and suspended sediment as well as high pH and pH changes are what damage the seals, it is rare that it is a physical obstruction that cleaning would solve is the culprit for a dead pump.
 
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