When to change RO filters?

[KevinK]

Kind of what you ar saying is that back flushing is nothing more than allowing the full amount of water go in and out of the housing.

This in turn would mean that in my case I have to gust cut the line (out) directly behind the housing of the RO and put a T in with on one side a little tap

Open this new installed tap, and it flushes ( bypassing the DI, and the flow restrict or)

Wayne, in this case I might drop you a line after x mass ( than you can maybe also give me some pointers for using my camera taking close up)