A New Model Now Available. This is truly one of the largest fiberglass pools available in the world. With inside dimensions a true 18 ft. x 42 ft., you will have lots of room to swim, perform water aerobics, swim laps, and enjoy a cool dip during the long, hot, humid, summertime. No other fiberglass pool available offers you over 710 sq. ft. of pure uninterrupted aquatic enjoyment. Just like the river of its name, the Guadalupe will offer you a lifetime of gentle water induced relaxation.