I totally understand your pain!!!!!
I LOVE swimming (I try to swim 3 times a week), though I'm not a competitive swimmer or anything. But I totallyu know what you mean - chlorine wreaks sooo much havoc on our precious hair!
anyway, there is this deep conditioner that I use from Paul Mitchell and also Nexxus (I alternate, b/c I firmly believe that products stop working after awhile), that is great for chlorine-wrecked hair. Unfortunately I don't have the products on me (I left them by accident at the Y), so I can't tell ya the name yet, but I will soon

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What really helps is immediatley after getting out of the pool, to rinse out your hair relaly well and use the deep conditionaer. It's also geat to use a leave-in (Infusium23 is great for leave-in conditioning). But you're a lifeguard, so I bet you're in and out of the water all the time - so I don't know if you can always rinse immediately

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Also, the best thing is to braid your hair (rather than just a ponytail or leaving it down) or something, so the water and sun won't wreak havoc that much!
Also you might try using a UV-infused conditioner! That really helps so if you color your hair, it won't turn green or orange (yuck)!
Sorry if this sounds so confusing! HTH! If any more questions, ask away

!