RODI and high ALK

[Manchild]

I recently purchased an RODI from my LFS which is a DR.G brand 5-Stage. I have been running it for the past 8 hours and my TDS reads zero, however, when I tested the ALK with my Salifert kit it only took one drop to change from blue to pink. Any idea on what might be going on?

 

[saltyphish]

Wonder what it reads with salt mixed. Mix a small batch and see what your reading is. Ive never tested alk before mixing so not much help. Maybe someone else can add some insight. Free bump

 

[Manchild]

Here's something I thought of after I made this and looked over the salifert instructions again. I was originally running on little sleep when reading all the details of the instructions and after taking a second glance at it, if I added ONE drop of agent into the RODI water and it changed color then that would leave .98 ml of agent left which would mean 0 ALK. If I used the full 1 ML of agent then it would be high, correct?

 

[saltyphish]

Yes more regent used means higher alk measured

 

[Manchild]

Doh! Well I now feel like an idiot, last time I try to read instructions on little to no sleep. Therefore there is no ALK in my RODI as it only took one drop to change the color. I was reading the chart and levels vise versa

 

[saltyphish]

Sounds right the rodi should strip the water of everything. No worries now you know