TDS starting to read 1, what to change first?

[Aj Flip]

hi the RODI i have is the coralife 24GPD unit with the DI add on

all have been running for the same amount of time and now im getting 1 on my final TDS and no i dont have an inline TDS

so my question is, is my DI exhausted? or should i just change the carbon block and the prefilter?

thanks

[smorrow5773]

Just change the di resin

[Aj Flip]

thing is I don't know if it exhausted yet because I think it's the color changing one because it's green and is beginning to change to orange, so I'll just make a new batch of rodi and test the td$ again, I only make about 10 gal each week since august

[Toddrtrex]

First, make sure to change your carbon and pre-filter every 6 months.

Odds are it is your DI resin that is going, but to make sure test the TDS of your tap, and then the TDS of the water after the RO, but BEFORE the DI.

[lurchccd]

+1

[Aj Flip]

ok I'll disconnect the DI and make RO then test it

[HASBRO]

That is one part per million of total disolved solids in your water.99.9999% pure water. My RO water test out at 10 and been holding steady.

[HASBRO]

That is one part per million of total disolved solids in your water.99.9999% pure water. My RO water test out at 10 and been holding steady.

[Aj Flip]

ya but I don't want that 1ppm to be phosphate or copper

[HASBRO]

Even if it were 1ppm of copper it would be a shooter glass in a large swimming pool.