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In my experience it is the only thing that can cause a pump to stop, but unless you run the pump dry or sand gets in, they should last almost forever. If they are damaged you can almost see through the recess the ball rests in, it will be thinned and translucent, it can also melt around the edges of where the ball sits. I lost one to sand, I have had a customer lose one to a dry test run, they are cheap, like $4, so it wouldn't be a bad thing to have a spare of but you may never need it.
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Roger Vitko
Tunze USA
"He's for every one of us, stands for every one of us, he'll save every man, woman and child in a mighty Flash!"
Current Tank Info: 210 gallon planted tank with Altum Angelfish
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