Masters swim teams are one place to go to get good workouts, but
they're not often geared towards triathletes. They tend to concentrate
on swimming fast and doing lots of yardage and distance instead of
offering appropriate technique help.
Training for an open water triathlon swim is not the same as training
for competitive swimming. It requires more attention to the proper
technique than ordinary high yardage anaerobic workouts.
http://triaswim.blogspot.com/#