To see a swimming pool in your dream usually represents relaxation, calm, luxury and easiness. If you feel your life is in a comfortable place right now and you have no complaints or worries then the pool could be an embodiment of how you perceive things to be in your waking life.
It could also mean that you are simply bobbing along in life and not really giving yourself or finding yourself with any challenges in your working life or at home. Perhaps it's time to move on from your job, seek out a new relationship or look for something new to occupy your time in your home-life.
Alternatively it might mean that you need to have a greater understanding of your feelings. Perhaps you are only dealing with what is on the surface and not what's underneath. It may be time to dive in and see what is going on deep down rather than what you choose to show others.
If you saw an attendant who was stopping you from swimming- this might be symbolic of you-maybe you are the one not allowing yourself to look at things at a deeper level. Perhaps someone in your life cannot cope with that sort of exploration into your past and is encouraging you not to do so or not supporting you while you do.
Maybe you feel you need to wash away something that's been clinging onto you for a while. A past hurt or pain that you feel you can't shake all that easily but someone or something is holding you back.