Does Anyone Measure ORP? - Page 2 - The Planted Tank Forum
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post #16 of 19 (permalink) Old 05-15-2020, 04:58 PM Thread Starter
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People are referring to Tom Barr and if you read enough of his writings he is constantly preaching balance. Having a all these probes to measure balance and what is normal is really handy.
Hi allexx46,

TB may 'preach' the importance of so-called 'balance'. But, I'm a scientist and I don't know what is meant by 'balance'. It's open to interpretation. That's precisely why I'm interested in ORP measurement. It was Lord Kelvin who originally said "If you don't measure it, you can't manage it".

Anon

"When you can measure what you are speaking about, and express it in numbers, you know something about it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind; it may be the beginning of knowledge, but you have scarcely, in your thoughts advanced to the stage of science." ― Lord Kelvin
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post #17 of 19 (permalink) Old 05-15-2020, 06:32 PM
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Sorry, I posted the wrong link. This is the one I was thinking about regarding TDS.

https://forum.neptunesystems.com/sho...for-Freshwater

Style: Organic potting soil, gravel, sand, wood, plants, algae, biofilm, snails, shrimp, fish, dual siestas
Tech : Small tanks, Fluval Plant 3.0, Top Fin MF10, Eheim Classic 150, Neptune Systems Apex EL
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post #18 of 19 (permalink) Old 05-19-2020, 02:23 AM
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Originally Posted by Anon View Post
Hi allexx46,

TB may 'preach' the importance of so-called 'balance'. But, I'm a scientist and I don't know what is meant by 'balance'. It's open to interpretation. That's precisely why I'm interested in ORP measurement. It was Lord Kelvin who originally said "If you don't measure it, you can't manage it".

Anon

So did you read Allexx's reply about the lack of precision in ORP probes? Was Thomas of Aquinas ever quoted, "If your probe is giving you a 20% margin of error, err on the side of 'it's good enough' "..



BTW using ORP metering has been used in saltwater and with the Booth's early high tech freshwater planted tanks back in the early 1990's as a guide for how their tank's redox was faring, it was a good sign that their water needed changing and their filters and gravel cleaned.

Starting small, keeping it simple..(?)
250 gallon stock tank, "pond"
20 gallon H CBS Shrimp tank

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post #19 of 19 (permalink) Old 05-19-2020, 03:16 PM Thread Starter
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Originally Posted by GrampsGrunge View Post
So did you read Allexx's reply about the lack of precision in ORP probes? Was Thomas of Aquinas ever quoted, "If your probe is giving you a 20% margin of error, err on the side of 'it's good enough' "..

BTW using ORP metering has been used in saltwater and with the Booth's early high tech freshwater planted tanks back in the early 1990's as a guide for how their tank's redox was faring, it was a good sign that their water needed changing and their filters and gravel cleaned.
Hi GrampsGrunge

The lack of precision in taking ORP measurements is well-documented and it's my experience too. I'm not sure how Thomas of Aquinas fits into this.

I'd forgotten about George Booth's experiments using ORP electrodes. Thanks for the reminder.

Anon

"When you can measure what you are speaking about, and express it in numbers, you know something about it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind; it may be the beginning of knowledge, but you have scarcely, in your thoughts advanced to the stage of science." ― Lord Kelvin
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