Tony,
Will send a mail later, the first backflush I did I managed to get 2500l extra,
it then went up to 001 and did the process again. Have managed to get a
futher 1000l and the TDS has just gone up tonight so I will try it again
tomorrow.
The reason why it does this is tunnels are formed in your di vessel so when the
water enters your vessel it is flowing against only a portion of resin.
Backlushing gets rid of the tunnels which the water then runs through
resin that still has not been depleted.
You learn something every day.
Doug