Help.......My 300 gallon galvanized tank has sprung a leak and it is time to replace it.I have a 2hp submersible pump feeding it.I pump water to two houses and to four green houses and misc irrigation zones.I was wondering the following ...is there a clear advantage in price/longevity of on type of tank over the other?I currently have a bleeder valve on the pipe feeding the tank,so water logging has not been a problem.My switch is set 30-60 and cycling has not been a problem.Bladder tanks seem to be much more common in this area,but will they out last my previous 15 year old galvanized tank.