Yes, anyone from the CX group can use it. The pool is open all year and the fitness centre is pretty good. Less machines that over at the gym at the headland, but at least you can work out with a view and are not stuck in the basement. I think it costs $20 to use the facilities if you're not a member. opening times are:
Pool: Mon - Fri 0730 - 1900 Sat 0930 - 1700
Fit centre: Mon - Fri 0730 - 1930 Sat 0930 -1800
Sauna: Mon -Fri 0730 - 1900 Sat 0930 - 1730
Sundays, all closed. Don't know about public holidays but suspect closed. Also note that the pool sometimes get closed for pool drills.