Just noticed TDS is not 0 with RODI water...

[testuser]

Just noticed that my DI filter started to change color to brownish at the bottom and tested the TDS and got 15ppm post RODI with my 4 stage... Could this be the reason why my coral all of a sudden started not doing so hot? Wasn't sure how dire 15ppm for TDS was. Feels bad man.

 

[ForTheLoveOfCoral21]

This would not cause your coral to all of a sudden do bad, it would cause a slight increase in potential algae.

What are the other levels in your tank?

 

[testuser]

This would not cause your coral to all of a sudden do bad, it would cause a slight increase in potential algae.

What are the other levels in your tank?

That's fine, alright, good to know. Was just concerned if that was it. Too much history for the problems, but water chemistry was fine. I have another thread about my hammer offing itself randomly and was curious if it was related. Appreciate the insight, and I'll replace that filter.

 

[ca1ore]

However, TDS should be zero so either the meter is bad or you need to replace resin, RO membrane …. or both. I get 5 out of my RO and then 0 after DI.

 

[Reefer Matt Verified Media Partner]

In my opinion it depends on what that 15 ppm tds is. Is it ammonia, phosphate, nitrate, silica, copper, etc? Lots of possibilities. When the resin expires, it often releases things in higher concentrations than normally in the source water. An ICP test could tell you what was in it before you change the resin, if you wanted to know for sure.

 

[Randy Holmes-Farley Verified Community Expert]

I agree that one cannot say it isn't a cause of coral issues without knowing what that 15 ppm is.