So I purchased a second hand Neptune Jetted tub (that has not been used before) and I just want to confirm if this is one of those old style tubs that has a problem with all the water not draining out of the pipes or not. I believe the old style used flex pipes which sagged over time leading to this issue. Mine however has ridgid piping but is straight and does not arch up like most of the newer models. I want to know if this will cause any issues in the future because I still have a chance to redo the piping right now if that's the cause.