I have a Fleck 5600 that has been in service for many years. I cant remember how high the iron content is but it was high. I started having problems with the water not staying soft for very long after regen. So I replaced the media. That didn't really help, but from the looks of the media it was not a waste. Anyway, the unit appears to be working fine except for excessive water in the brine tank. I would like to replace ANY parts, washers,screens etc. when I have it apart. The unit has performed flawlessly for years so changing a few extra parts i would rather do while I have apart. Rather safe than sorry. I will need to order on line so I want to make sure I get everything first time. So I would like help with a parts/ kit list that you would recommend to change.