RODI TDS measurements

[scuba_steve]

I have a hair algae problem, and I'm trying to figure out why.

75g 150lb LR
I run a sump with chaeto algae.
All readings Ammonia, nitrite, nitrate = 0
PO4 = barely .2 using Red Sea test kit.
My RODI water has a 23 TDS reading.

My question is, what does everyone's TDS read for 1 RO and 2 RODI water? When I first started using my RODI, the TDS reading was 1-3. I wonder if my DI needs changing.

Any suggestions.

Oh yeah, re: the hair algae, I have not used a protein skimmer per the LFS. I just purchased a Remora skimmer.

 

[danmhippo]

My system's TDS readings are around 10 after RO, and less than 5 after DI.

However, pH after DI is the same as input tap water.

 

[Anonymous]

A TDS of 23 means it's time for some replacement parts for your RO/DI.

Good call purchasing the Remora. Are you doing regular water changes?

 

[scuba_steve]

5 gal water change every couple weeks.

I just recently replaced every filter except the RO membrane. I do have a spare membrane, I just thought they would last a couple years.

Should i replace it?

 

[Anonymous]

I would, yes.