If you choose to get tubes, your child would get a set of earplugs that would be worn during bath time and swimming. They should not get water into their ears when they have tubes.
I had 2 sets of tubes. I'm in my 30's. I have really bad ears still. I've had 7 blown ear drums in both ears. Sometimes I don't even feel the pressure until it's too late. Now, as soon as my hearing gets muffled, I go on alert for an infection. Most time, when I go, I already have an infection and close to a burst ear drum.
Before deciding to get tubes, I would suggest keeping a food journal to see if there is a certain food that is causing the ear infections.
It is my experience, and some science that ear infections are related to food allergies. My daughter, when 3y got 3 infections in 6 weeks. I realized that she had started eating a ton of watermelon. I had her stop, and the infections stopped.
My son would get them, along with high fevers at age 1-2y. We talked about getting tubes done. I started a food journal and realized that he was allergic to pears. We removed pears and pear juice from his diet, and he is now almost 13, and has only had a few ear infections in the last 10 years.
http://www.earallergy.com/freedom-from-chronic-ear-infect...
http://www.allergyconnection.com/articles/earinfec.html
http://www.webmd.com/allergies/news/20040622/food-allergi...
http://www.consumer-health.com/services/cons_take44.php