How do you prevent swimmer’s ear?

We took the kids to a waterpark over the weekend (super fun!) and I got the lovely parting gift of swimmer’s ear.

Is there a way to prevent it? My 9 year old is obsessed with the wave pool, but I would never let him be in there alone. That being said, the waves do hit you in awkward ways and put water in your ears. 😬
How do you prevent swimmer’s ear?
How do you prevent swimmer’s ear?
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