I was told to leave the pump in the water to prevent the seals from drying out.
Initially, I separated the pumps from the frames and stored the pumps in a bucket of water. I have two pumps mounted on metal frames which have become rusted over the years. The pumps are about twelve years old, and for the last nine or ten years, I disconnected the power and leave the complete units under the dock.
Both units are still running fine, and I only needed to replace the occasional plastic propeller.
Hope this helps.
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