[ian1965]

I have just checked my tds reading when I turned on the tap the initial reading was 100  then checked 2-3 min later down to 35 then again 2-3 min then to 12 stayed at 12 so then conected to di. Is it normal for the intial reading to be high when 1st turning the system on? 

[Ian Lancaster]

Mine always is, but not that high.  If yours settles down to 12 and stays there then I wouldn't worry about it.

[A & J Owen Window Cleaning]

if you are in a softwater area does take a while to get the proper reading where you based then mate

[A & J Owen Window Cleaning]

me spelling is all over the place its if you are in a softwater area

[ian1965]

Thanks all,  I have never checked before but will now let the tds settle down before connecting to the di. Lesson learnt! Hard water area.

[Peter Fogwill]

Its called TDS creep, and happens every time you first run water through the system once it has been turned off.  Not usually such a big difference but will depend on water hardness, system, pressure, etc etc.  Best to flush or leave the pipe to the DI disconnected for a few minutes each time you turn the water on.

Peter Fogwill
www.window-tools.com

[Window Washers]

Its called TDS creep, and happens every time you first run water through the system once it has been turned off.  Not usually such a big difference but will depend on water hardness, system, pressure, etc etc.  Best to flush or leave the pipe to the DI disconnected for a few minutes each time you turn the water on.

Peter Fogwill
www.window-tools.com

if you dont follow this advice it will cost you in resin quite alot if your in high tds areas, south east is high.:

My tds when turning on can be over 500 tds, 4/5 mins in flush with di connection in drain brings down to 6. re connect di then fill away.

[ian1965]

Yes a very good lesson learnt with this, i am guessing it took in total about 10 mins to settle down. thanks again for the advice.