Orp is at 30 .

[MohamedF]

Good day everyone , I just installed ghl Profilux , I calibrated and tested the redox probe , then I put into aquarium for first time , my aquarium orp is at 30 ..
I tested my ro water it was 200 , I made two salt solutions from two different salts ( my local fish store and Red Sea Coral salt ) each of them came with same orp 30 also ..
means that the fresh salt solution is the same as aquarium also , but both at 30 which is as far as I read extremely low , at first I suspected my aquarium as it’s considerably fresh ( three months old ) but then when I got the same result from fresh salt I for mixed up . Any ideas ?

 

[ReeferCPA]

Following. I would love to learn more regarding ORP/Redox

 

[fryman]

Probably test error. I do not believe you have an orp of 30, but if you did I think it would have no oxygen and the water would be toxic to most things.

Orp isn't really useful unless you use ozone anyway.

 

[Jeffcb]

Must be a false reading

 

[MohamedF]

I retried again make a fresh redsea salt mix , left the probe into it overnight and the reading is 40 . Can’t be error in reading as the moment I put it in the calibration solution of 220 it reads instantly 220 .. well I guess I will just not bother myself with redox anymore as it’s crazy steady between 30-35 in my tank for now .

 

[Viking_Reefing]

I find that freshly mixed water generally has a low orp, might be some particles that are left over.
My father who’s a project manager responsible for industrial projects with equipment in the 10+ million range once said something that I really took to heart: strange reading are basically always faulty measurement equipment and just having one thing measuring a value is lunacy

 

[MohamedF]

I find that freshly mixed water generally has a low orp, might be some particles that are left over.
My father who’s a project manager responsible for industrial projects with equipment in the 10+ million range once said something that I really took to heart: strange reading are basically always faulty measurement equipment and just having one thing measuring a value is lunacy

these are wise words .. I will always keep them in mind ..

 

[kilnakorr]

Most likely not a correct reading.
When looking at the other data in your picture, the sodium levels are low compared to your salinity (at least what I remember).
Sodium levels at 35ppt is about 11000ppm
Your sodium level at 36.7ppt is 10000 ppm.
I'm no Randy Holmes, but these measurements could also just be minor errors.
If tank looks good, then leave it be

 

[Randy Holmes-Farley Verified Community Expert]

Let it equilibrate in the tank for a number of days and let’s see what happens.

 

[MohamedF]

Let it equilibrate in the tank for a number of days and let’s see what happens.

I stopped dosing microbacter clean and cyano clean just in case , and I will leave it for like a week without any kind of bacteria dosing also to see where it will stand . Thanks

 

[MohamedF]

Most likely not a correct reading.
When looking at the other data in your picture, the sodium levels are low compared to your salinity (at least what I remember).
Sodium levels at 35ppt is about 11000ppm
Your sodium level at 36.7ppt is 10000 ppm.
I'm no Randy Holmes, but these measurements could also just be minor errors.
If tank looks good, then leave it be

Well yes I know there is always a margin of error , but I’m sure prone is ok as I used external device also to double check and it gave same measurement, also when I put the probe in my ro water immediately it hits 200 means that it’s working for sure . I guess I will just wait and see where it will go to in like a week from now . When electricity cuts it’s the worst , it reaches 20

 

[kilnakorr]

Well yes I know there is always a margin of error , but I’m sure prone is ok as I used external device also to double check and it gave same measurement, also when I put the probe in my ro water immediately it hits 200 means that it’s working for sure . I guess I will just wait and see where it will go to in like a week from now . When electricity cuts it’s the worst , it reaches 20

I recently had a thread as my ORP readings was a bit funky.
I found out my UV unit was interfering with the readings, lowering the reading.
Not sure what you mean when you say ' when electricity cuts it's the worst'.
Have you tried taking a cup of tank water and take a reading, outside of the tank?

 

[MohamedF]

I recently had a thread as my ORP readings was a bit funky.
I found out my UV unit was interfering with the readings, lowering the reading.
Not sure what you mean when you say ' when electricity cuts it's the worst'.
Have you tried taking a cup of tank water and take a reading, outside of the tank?

Yes I did . And still reads 30’s , during electricity cut the orp reaches 20’s which is like dead point to me .
I didn’t try to turn off the uv . Maybe I will turn it off and see the reading in the morning .

 

[MohamedF]

Yes I did . And still reads 30’s , during electricity cut the orp reaches 20’s which is like dead point to me .
I didn’t try to turn off the uv . Maybe I will turn it off and see the reading in the morning .

The mix I have is that : when I use the probe on freshwater “ro “ immediately reads 200 mV , when I put in 220 calibration solution it reads immediately the right degree , “ 221 “ , and as far as I know the fresh salt mix “ Red Sea coral pro “ should be 200+ MV , but when I put the probe in the fresh salt it gives 40 MV . That makes me a bit spinning around .

 

[Randy Holmes-Farley Verified Community Expert]

The mix I have is that : when I use the probe on freshwater “ro “ immediately reads 200 mV , when I put in 220 calibration solution it reads immediately the right degree , “ 221 “ , and as far as I know the fresh salt mix “ Red Sea coral pro “ should be 200+ MV , but when I put the probe in the fresh salt it gives 40 MV . That makes me a bit spinning around .

I do not know what value is expected in any given salt mix, but they are often low and I attribute that to use of low ORP trace elements such as ferrous iron.

 

[kilnakorr]

I do not know what value is expected in any given salt mix, but they are often low and I attribute that to use of low ORP trace elements such as ferrous iron.

I second that. My ORP drops every morning with my daily 1.5-ish% WC.

 

[MohamedF]

I do not know what value is expected in any given salt mix, but they are often low and I attribute that to use of low ORP trace elements such as ferrous iron.

It’s because I read before that the salt mix “ fresh “ orp is around 200’s , so if someone’s tank is at 300 then it will for sure drop with the new salt . I have addressed my local salt manufacturer as well who will check with his chemist to add orp trace elements to the salt by default , as I also suspected the salt to be the reason for that . I will keep updating here as well . Thanks Randy

 

[MohamedF]

I second that. My ORP drops every morning with my daily 1.5-ish% WC.

Did you try to check value of your fresh salt mix ? ( if the salt mix is old I believe it’s orp drops a lot as well ) , but did you check the orp value of the water that you change ?

 

[kilnakorr]

Did you try to check value of your fresh salt mix ? ( if the salt mix is old I believe it’s orp drops a lot as well ) , but did you check the orp value of the water that you change ?

I haven't checked that. However freshly mixed only lowered the ORP back when I did weekly waterchanges. I'm pretty sure that is quite common.

 

[Randy Holmes-Farley Verified Community Expert]

Many people report low ORP in new salt water, and the reason is because of how it is formulated. It is not any sort of problem.
.