Phosphates in RODI water?

[Tbyram]

So I’ve been working on lowering my phosphates. I tested my RODI water and the phosphates were above 2.5ppm measured by Hanna ULR (Hanna phosphorus maxed at 200). Does the RODI system not clean this? I couldn’t find any info on the water board site report measuring it. Any insight?

 

[Justfebreezeit]

https://www.reef2reef.com/threads/phosphate-in-my-rodi-water.94794/

old thread that discusses this

 

[Justfebreezeit]

Basically what you can take away here is the Hanna dosen't accurtely measure RODI water. You can try taking a gallon of RODI and mixing in salt to get your normally salinity level and try measuring it that way.

 

[Tbyram]

Thanks. I’ll try testing my fresh saltwater tomorrow to see what I get.