17+ Galvanized Pressure Tank Vs Bladder Tank US . A temporary fix would be to add air pressure. If your bladder tank, pump and the bladder is about a third the cost of a new tank. Water Source Steel Air Volume Control For Tanks Up To 120 Gal Av100 The Home Depot from images.homedepot-static.com A bladder is a balloon inside a tank that fills with water when there is pressure that is greater than that already in the bladder. A bladder tank is a large, flexible container used to store many types of liquids. I now have the constant pressure system, but still use a 120 gallon galvanized tank both for storage and sulphur gas removal along with two 42 gallon equivalent bladder tanks. Pressure tank vs constant pressure dilemma. With pump mounted on tank* single installation multiple installation to system pressure switch the pump can be mounted on the from well tank using a universal mountin