Your array should last approximately 75-1100+ sessions before needing to be replaced. Wear of the array depends upon several factors such as how salt is added to the water and how toxic the person is who is doing the sessions.
The series of photos below are of a single array that has recently been replaced. This array was sent to us by a customer for demonstration purposes. This is what we mean when we say that one side of the array will lose material to the other side! The other obvious change is that the bars and plates have lost their sharp angles- every edge on the array has become more rounded, compared to when it was new.
You can extend the life of your entire array by switching the gold plugs at the level of the power supply every other treatment. The gold plugs on your array cable are marked with either a red band, or a black band. These correspond to the red and black plugs on your power unit. (Session #1, red-red, black-black; Session #2, red-black, red-black; Session #3, red-red, black-black, etc.)
There is not a single part of your array that really cares what type of energy it is receiving. We use the same batch of Turbo Plates for both sides of the array; all our cables come off the same spool of wire, and all of our steel bars are made exactly the same way. The metal parts and insulators in our arrays don’t know the difference between positive and negative current- it is completely safe to plug a gold plug labeled as “red” into the “black” plug on the power unit, due to the design of our array. The only thing that “reversing” the plugs does is change the current flow direction through the array. Reversing the flow direction DOES NOT create “positive” ions.