I install Wellmate WM series and HP series tanks and have had 1 or 2 fail in the last 5 years...out of hundreds. I think they are great, however I have never installed one from the side port series. You mentioned the tank was waterlogged in the thread, and that it caused short cycling and was bringing up debris (actually it was surge developing the well). That tank has no bladder, it was waterlogged becasue some other part of the system failed. This system MUST have some device to add air to the tank, either a bleeder in the drop pipe or a micronizer before the tank. Either method can fail, and the air level needs to be periodically checked...... I wonder if it ran for a long time in a waterlogged state, with no cushion, that all the shock contributed to it's failure. The air also greatly helps remove sulphur smell, no air explains why you started smelling it again. You need to make sure that this replacement tank is being fed some air before it becomes waterlogged again.