Other Bilge switch keeps taking a poop

Is there an issue with just running a rule 500gph constantly? Just just done with a ride and my 3rd switch took a :):):):) on me. I'm usually out on the water all day in 1-2 hr. intervals then hang on the beach for a bit.

I know they say those bilges are able to be ran dry, but will that shorten its life substantially or risk burning it up?
 
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