Troubleshooting RO/DI following filter replacement

[amos]

I just replaced replaced the filter and carbon blocks for my RO/DI using the following from airwaterice:

 

1 Sediment 10 Micron

1 Coconut Carbon Block 5 Micron

1 Coconut Carbon Block One Micron

 

It was reading 3-4 TDS before the change, and now is reading 4-5 TDS following a run of 5 gallons. Does any have any suggestions?

 

Is it possible I reversed my block 5/block 1 micro carbon blocks? Is there anyway to determine which is which by sight?

 

Thanks,

 

Jon

[dtfleming]

those fitler have nothing to do with lowering your tds. the ro membrane and di resin lower tds. Those filter reduce sediment from getting to the ro membrane.

[quazi]

those fitler have nothing to do with lowering your tds. the ro membrane and di resin lower tds. Those filter reduce sediment from getting to the ro membrane.

 

Exactly! I would bet you need to replace your DI. Do you have an inline TDS meter? Can you check the RO before it goes into the DI filter?

[Origami]

Also, Jon, if you haven't made RO/DI water in a few days, AWI recommends that you backflush your membrane for two minutes before making new RO/DI water. If you don't your initial water output can have higher TDS readings. Finally, the AWI system that I have uses a color changing DI resin. It goes from a blue color to a brown/orange color when exhausted.