That's just on 90% which isn't to bad,
I am still using the Merlin's and there is some jobs I connect up to where it will give me 008 and other that give me anything upto 101 on one job ( which I definatley didn't bother with ) I will accept upto 030 normally or maybe 040 if am desperate, this all before di
As I have found out it all depends on tap pressure as well as tap tds levels, I had a job were I checked tds one minute and it was ok and another it was a lot higher, this was down to others using taps inside that ran off the same supply. I was puddled at first what was happening but the pressure kept dropping which affected the RO's