I used to use Ultraswim all the time when I used to swim before work and I never had a problem. My hair did go slightly green one time on holiday but sorted itself out somehow.

If you use salon shampoos and conditioners rather than what you can buy off the shelf so to speak, then Kerastase do a good range specially for use for holidays/swimming etc. Most of the salon ranges have something which is suitable too.

Agree with the slapping on of conditioner during the day, it does act as a sheild against the sun and sea/pool water and it also stops it drying out in the strong rays.

Have a great time!