Something I Observed

Skim

Active Member
Joined
Jan 3, 2014
Location
Brantford, Ontario
So the other day I got my ORP probe, I wanted to hook up my Red Sea Ozone unit but I believe it did like being stored, ORP readings out of this world. I have a Pin Point ORP monitor also so I hooked up the probe to it works great after about an hour 268 not to bad and stable. Two days ago I pulled my skimmer and put in another think I would clean the one I pulled, well got it going and noticed that after about 45 min. ORP rose to 285 and would float around 283 to 285. Today for the fun of it I pulled that skimmer and replaced with another, so before I plugged it in I looked at the ORP and it was 275 and after about 30 min it was at 285 and rising last I looked it was at 300 and rising. It makes me wonder, is this showing in some small way the efficiency of the different skimmers or is it just one those strange things that happen. I will have to keep an eye on it, as I am not used to seeing the ORP rise if anything I used to to it fall, putting hand in the water feeding, stirring thing about.
 

AdInfinitum

Super Active Member
Joined
Jan 12, 2012
Location
Thorndale, Ontario
Oxidation Reduction Potential... in a biological system is an unbelievably complex and often vague or counter intuitive measure. It is an absolute must to monitor on a relative basis as a safety check when dosing ozone but other than that, the interrelationships that affect it make it very difficult to interpret results in a purely cause/effect manner. I wandered into it when I was doing effluent analysis but found it of limited use due to the overwhelming complexity of factors affecting absolute numbers.
 

Skim

Active Member
Joined
Jan 3, 2014
Location
Brantford, Ontario
ORP well that is a tough one, very basic explanation is it's the Oxidizing potential of a liquid. The lower the number ( even into the negatives ) is bad, dirty filthy and the higher the numbers the cleaner to the point that everything is Oxidized like in Bottled water. Seawater is around 200mv to 400mv, a good healthy aquarium will be min. 250mv to 350mv with Ozone you can get to 400mv to 450mv. You do not want to go much above 450mv as you will start to have a negative affect and bleach everything a count of 650mv will kill Bacteria in seconds.
So very basic is lower means Dirty organic ridden water, higher numbers mean purer waters.
If you need more info Randy Holmes goes into great detail on ORP and can be found easily on the Net.
 

Skim

Active Member
Joined
Jan 3, 2014
Location
Brantford, Ontario
Well actually ORP reading can be quite useful. It tells you how your tank is doing and reacts faster than anything else. If you lose a fish and don't know or have have been feeding too much and have a lot of food decaying or if you are carbon dosing or using bio pellets it will let you know if you are overdoing it because your ORP will drop and it will drop and stay there long before you see anything or your PH reacts. Basicly its like having an alarm and telling you something is wrong. I know nowadays it is not really looked at, don't know why, but go back 20 years 2 things that people had was a PH monitor and a ORP.
You could actually use it, to tell you when to do water changes, if you set a point say anything above 280 is fine and when it drops below 270 and stays do a change may say you some money by not using the salt up as fast. If you use Carbon then you can use it to tell you when to change it as you ORP will drop as your Carbon stops working. If you have a Apex it would be a great thing to monitor.
Oh ya, last look my ORP is up at 306 mv since I put the other skimmer in.
 

Nighthawk26

Active Member
Joined
Apr 10, 2015
Location
Waterloo
Yeah, cars have something like this too. I believe it is often referred too as "the idiot light".

Your example at the end makes the point. Just these two variables you give (when really there are many more). Uh oh. Alarm went off. So do I change carbon or do a water change?


Sent from my SM-G920W8 using Tapatalk
 

Skim

Active Member
Joined
Jan 3, 2014
Location
Brantford, Ontario
The point is it makes you look, to investigate and it will respond the fastest if something is not right. Out of everything you can plug into an Apex the ORP probe will react the fastest if something has gone array, except like a leak. That is such a dumb name for the Eng. light your on the 401 your light comes on I guess you would know what is the problem. That idiot light got your attention and your are going to look to see what the cause is. Change Carbon or water well I guess you would have to think back did I just do a water change a short time ago, and also ask yourself when did I change my Carbon last. The point again it made you look. Ok just got home from work you go to see the tank do a little feeding looks good what ORP is at 180 what is going on, all this fish are accounted for, look a piece of Coral broke off and land on the Elegance and burning the crap out of it or vice versa. Again point is it made you look.
Most of the stuff I post on here like this is because I just noticed something as I was doing stuff and made me wonder or I post stuff because there are quite a few new Reefers on here that it may help or get them to seek out an answer. I have been doing this for sometime as I believe you have, but one thing I won't do is try and make someone sound like an Idiot or make wise cracks because I may not agree with them. So on that note I will try and not make anymore posts but follow yours because I guess mine are Idiotic and stupid. The Forum is yours Sir Nighthawk.
 

Alberych

New Member
Joined
May 15, 2016
Location
Brampton
Hey regarding your original question and the ORP changes your skimmer induced, couldn't you answer the question by measuring the ORP of your skimmate? Or at least get an idea. If the ORP of your skimmate is way lower (as I assume it would be?) then by removing it you should raise the ORP in your tank.
 

Nighthawk26

Active Member
Joined
Apr 10, 2015
Location
Waterloo
The point is it makes you look, to investigate and it will respond the fastest if something is not right. Out of everything you can plug into an Apex the ORP probe will react the fastest if something has gone array, except like a leak. That is such a dumb name for the Eng. light your on the 401 your light comes on I guess you would know what is the problem. That idiot light got your attention and your are going to look to see what the cause is. Change Carbon or water well I guess you would have to think back did I just do a water change a short time ago, and also ask yourself when did I change my Carbon last. The point again it made you look. Ok just got home from work you go to see the tank do a little feeding looks good what ORP is at 180 what is going on, all this fish are accounted for, look a piece of Coral broke off and land on the Elegance and burning the crap out of it or vice versa. Again point is it made you look.
Most of the stuff I post on here like this is because I just noticed something as I was doing stuff and made me wonder or I post stuff because there are quite a few new Reefers on here that it may help or get them to seek out an answer. I have been doing this for sometime as I believe you have, but one thing I won't do is try and make someone sound like an Idiot or make wise cracks because I may not agree with them. So on that note I will try and not make anymore posts but follow yours because I guess mine are Idiotic and stupid. The Forum is yours Sir Nighthawk.
In no way was my intention to call you stupid in any way. I assure you. I know less than the majority of people on here, I can assure you of that. You have made many posts as you describe based on experience which I do enjoy, no question. I certainly hope you did not take the idiot light as a hit to you. Literally I would say most people would agree it is a more than common term, and I would also bet most have or have at least had a car with this go off, take it to a shop and not a single problem can be found. They then proceed to drive the next 100k like that all while anyone who sees it says "hey, you know your light is on, right?"

My point is essentially saying the same thing you are. You are just having a stronger appreciation for it I suppose. To me, I come home, look at the tank, and if something looks wrong, I KNOW something looks wrong. It is also just that. Perhaps it is because I am so new that I look many times a day at things. Mostly out-of curiosity, but also for concern of spotting negative change.

That is all. Apologies if you felt i was being offensive to you. I assure you, it was absolutely not my intention. We don't' all know each other here in person so perhaps it is harder online, but I can tell you one thing about me. If I mean to be offensive or basically call someone stupid, I don't' tend to leave much room for interpretation. Have a great day brother.

Sent from my SM-G920W8 using Tapatalk
 

Kman

Super Active Member
Joined
Apr 15, 2014
Location
KW
If your numbers are within the tolerances I would not worry. Measuring ORP is complex and many things can change the number. Even something as simple as a grounding probe can interfere with the numbers. Measuring it is a good indicator for situations like you have large swing in water quality or if the number is sedately going up or down indicating a slow improvement or decline in quality. It will give you a good indication to look at your tank. It enables you to have a good idea if your water parameters are getting worse or better or if something big has impacted the water quality like a large die off.

The difference in numbers could indicate differences in skimmer efficiency but it could also be caused by your hands going into the water or impurities on the skimmer itself. The oils, soaps, perfumes and environmental pollutants will temporarily disrupt the chemical composition of your tank resulting in the numbers going up or down.
 

Hong

Member
Joined
Aug 31, 2015
Location
Kitchener, Ontario
I'm a newbie and appreciate personal experiences/observations. I may not follow/understand everything anybody says, but it does make me look, inquire and seek information. Thank you for posting.:)
 
Top