My old PM 422 Ca Reactor didn't have the pump cemented down so maybe they didn't use to do it. The pump would slide off of its base and only the base was cemented to the base of the reactor. I now run a used PM 622 but I'm not sure about it as I haven't needed to dismantle it yet. However you do have me a little paranoid now so maybe I'll try it and see what happens.
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