I live in mexico and help run a mission. We are on city water but because the presure is not good and it goes off all the time we have the water go into a tank and then pump it to the mission. We also have 150 people here taking showers and flushing tolets. We have a blader tank on the system. Our pump has gone out and am looking for a good replacement. We are on a tight budget but want something that we could replace the seals when they go out (not a through away). This water is not for drinking but is used for everything else. We also pump our drinking water out of a tank and is run inside to facuets, is it nessesary to use stanless or will something else do.