I just did this today. Found here on Pinterest a while back and thought what a neat idea since we use our pool almost everyday in the warmer months. Just buy a shower rod, this one is a tension one and then I used the hooks to hang the curtain on, as hooks for the wet suits and towels instead.
Build Twin Closet Shelves: Build closet shelves that double your storage space with these plans for twin shelves. Take your closet real estate to its full potential and store twice as much. Read more: http://www.familyhandyman.com/closet/build-twin-closet-shelves/view-all