I have heard that uou can good luck
http://www.womenshealthmag.com/style/swim-workout#.
http://www.mensfitness.com/training/lose-weight/plunge-into-cardio-how-to-swim-off-the-calories
Swimming is great exercise, and combined with eating clean, you probably will lose weight.
Swimming is my favorite way to decompress, exercise & lose weight.