Tds reading

Change filters. You should be at 0.

 

Check the water coming right out of the unit in case something is in your container

 

In my opinion 4 really isn't that bad. To me the trend is what is important. If you went from 0 to 4 then it is time to change either the filters or the resin or both (I usually need to change the resin 1-2 times between filter changes). Ours is usually at 0-2 out of the unit but when it starts to climb up to 6-7 then I make changes. We go through a lot of RO/DI water though (100-110 gallons/week) so I don't change as quickly as some folks do.

 

+1 Did you calibrate the meter? New filters and resin should result in 0 TDS. Most people will make changes when they start seeing 1-2 TDS. Keeping the filters clean/changed will result in a slower usage of the DI resin. Also, flushing the membrane before or before and after making water will also help the membrane last longer as well as the resin. When I started replacing my fiters more frequentyly, I saw a drastic difference in going through much less resin :0)


BRS sells calibration solution for the TDS meters. Others might know who else sells it/DesktopModules/ActiveForums/themes/_default/emoticons/smile.gif

 

When did you take the reading from your RO/DI container? Both Air, Water & Ice, and BRS told me that TDS will rise in a container of RO/DI water, even if covered.

 

There was a thread about this not long ago. You can get a 4 just from the water sitting for a while.