I'm a swim teacher and my hair gets drenched for hours at a time in chlorine.
My suggestions would include a good rinse/wash after being in the pool - if you're trying to cut back on shampoo stick to WO or CO.
Oil of your choice applied lightly afterwards or (my fav) a drenching of oil the night before. This always means a wash afterwards for me but I find my hair copes with chlorine a lot better if it's soaked in coconut oil and braided the night before.
Otherwise if you want to wear a cap a light layer of vaseline between your head and the cap edge can help seal it. I find water still gets in when I swim laps so again I add oil to my hair before I swim.
Also from the POV of water aerobics you could try doing your exercises slightly shallower if possible as this gets your shoulders/hair away from the water - this of course means an easier workout so that might not appeal.
Good Luck
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