I wouldnt knock the power of a pool dude... best form of exercise you can do. You'll be building muscle mass in the pool to.. and on a much wider range of muscle groups than in the gym just doing specific weight training. summat to think about ... no point having arms like popeye and pidgeon chest, gotta work it all dude.

As for weight gain, i'd personally stick to just eating more red or white meat, plenty of fish and other 'sensible' foods. Ive never believed in all the get big quick toot... its not good for you in the long run. if ya gonna do it, do it properly over a few months and dont be too quick to be looking for results... it takes time and hard work.