From time to time a submersible pump's seal fails. They're in the water 24 hours a day, 7 days a week, so they won't last forever. This is the second time in 10 years of owning this toilet that I have had to change the seal due to wear and tear. They last a long time but weaken over time. Again, this is the second time in 10 years that it has had to be changed. So it took them about 5 years before they changed it!
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