Hydrogen peroxide dosing vs Ozone...compare and contrast

[Brian916]

To be clear, this is about longer term oxidizer dosing (with dose measurement and monitoring), not topical applications or dips for algae or pest treatment.

After watching a fair amount of BRS and other reef content on YouTube discussing the benefits of dosing ozone to clarify water and reduce risks of infectious bateria, I started to wonder about using hydrogen peroxide to similar effect (i know i am not the first). Naturally this became a rabbit hole of reading through threads and some literature with many emotions and anecdotes but perhaps not much science (excepting Randy as referenced below). There are several threads claiming that 10ml of 3-percent (or other small amount) hydrogen peroxide crashed a tank and others claiming that hydrogen peroxide dosing is dangerous, or pointless (maybe...). I wanted to gather any research that people have done on long term hydrogen peroxide dosing to compile a best practices for folks who are similarly curious and help answer some questions about when using an oxidizer to raise ORP might be helpful, what are the benefits or downsides of hydrogen peroxide relative to ozone, and when should we bother with hydrogen peroxide to address specific issues. If this exists, I didn't find it...but if it does, please show me the way?

According to this great article by Mr. Randy Holmes, (https://reefkeeping.com/issues/2003-12/rhf/feature/) there is questionable benefit to attempting to manage ORP with oxidizers in place of seeking to manage the underlying problems that might depress ORP; however, many folks have persisted and insist that running ozone or other oxidation methods can help manage nuisance algaes and other bacterial infestations and will help with water clarity.

The issue that got me going on this was the relative hazards related to dosing ozone:
1) Ozone is harmful to indoor air and needs to be quenched to avoid poluting your air quality
2) Ozone gas will burn many materials including the seals and tubing in a skimmer
3) Ozone is a stong oxidizer and mistakes with dosing can rocket ORP and harm the inhabitants
4) Ozone generators are expensive, are damaged by air moisture, and need maintenance and replacement.

And the potential relative benefits of hydrogen peroxide:
1) Has similar oxidation properties as ozone (albeit oxidation strength depends on concentration)
2) Does not release a harmful gas into indoor air
3) At 3-percent concentration it is much more difficult to overdose (but also a weaker oxidizer)
4) Unlikely to burn equipment except at very high concentration
5) Injection under UV lighting may enhance photolysis allowing for a stronger oxidation reaction with a weaker oxidant and a smaller UV light.
6) A gallon of 3% peroxide at Costco is usually <$10 making this a good value especially for smaller tanks .

Some questions...

-Why do people tend to prefer ozone over hydrogen peroxide?
-Are people adding peroxide to the intake of UV sterlizers or under strong UV lighting? Why dose at night instead of peak light cycle
-What are the measurable differences in using small high concentration doses of ozone versus a lower strength hydrogen peroxide dose to elevate ORP or address nuisance outbreaks in a reef aquarium?


I am a professional groundwater hydrologist with some experience in water treatment, but not a chemist or water treatment expert. With work and family balances, I am a frequently neglectful reefer and I am often looking for approaches that can give me some added security between extended water changes or those odd algae outbreaks that I am slow to address.

 

[Randy Holmes-Farley]

One difference is that hydrogen peroxide can also act as a reducing agent (the opposite of an oxidizer) and often lowers ORP when added. The ORP is no concern, but the reduction of cupric copper to cuprous copper and ferric iron to ferrous iron may have different effects than ozone, which can only oxidize.

That may impact the bioavailability and possible toxicity of trace elements, but I cannot say that one is better than the other in that regard.

 

[HomebroodExotics]

I believe that hydrogen peroxide is the most underutilized and most powerful chemical that we have access to in the hobby. But I'm a little weird. With that being said I also believe that hydrogen peroxide works really well in replacing water changes. I dose once a week at 1ml/gallon.

 

[Brian916]

Thanks for your reply Randy! Like many others I have seen the decrease in ORP during dosing. The chart below shows a 30 ml dose into my 65 gallon system over 4 hours.

I am curious to understand how much of that response is due to our ORP probe construction and how much is real? There has been much research into the disagreement between instrument readings and actual reaction kinetics for certain metals and probe configurations. Basically less expensive ORP probes don't always measure peroxyl free radicals very accurately. I am certainly going to read more about copper as that could be a major downside.

Your input is appreciated!

 

[Randy Holmes-Farley]

I don’t know if there are probe issues or not, but since hydrogen peroxide is known to reduce redox sensitive metals in seawater, I see no reason to not think it is real.

https://pdf.sciencedirectassets.com/271780/1-s2.0-S0304420309X90018/1-s2.0-S030442030990055X/main.pdf?X-Amz-Security-Token=IQoJb3JpZ2luX2VjECoaCXVzLWVhc3QtMSJIMEYCIQCO%2Fi21FeDVb%2BEyrVNAtoOGA7BVH8TMIX3cd7kWTXAGYwIhAIcujkjBWfwuyIFoOTDF7EsZ4PwmfuurJOec2AL1LmA0KrIFCGMQBRoMMDU5MDAzNTQ2ODY1Igzt8DI%2FGrH%2F8knJBdYqjwUZD8MyMGC5Q8iODg3EdHLJxMHfOg%2FB3Ufy%2BTUpugcWj4Mx3eiNXfQ9rpZEdG%2FiXkfrofizLsSQMIC1737oy0x3cOEzSAhF81dJngrOVSRIzNXrQMME5Wq1Myu37ABKXrUiqDnymbfoF%2BRagTWp6ofKwc2CJfpV4gDNWh6kcjfm2EXwto9sgNxEBusbrThRSCPs9kv%2F6paJia63pn4ubBkIuMMPxSokO5NTi5IU6%2F2DaQxDJUuIrJkgCWEeW5t22x7u57JW49dcgQQdfPIhRcPAMDiix6DVjRqs0yyYJAfExXSGs5dQLitcCYO7lwAkXK%2F7JmC0lMQchc3KOSH1poF%2Fk0z2rUv6rRvZ3tjsm6wkbEzD4Su%2BaCA%2Bct7cVrTsmVBZVfg9cfWWoDUDWKbl7rkKELo%2FIQ6yylxvkDWG%2FHJOO4tupw3zrIsYHEgv1uWZpveUhMxBN%2FcMitFtN0K4nCy2%2B%2BupeVqRfI3pwA8XlPr1neCdKguffHzHy9iE5%2FhUeiejK3aZXH%2FmMqQBieLVexNVr3X7qAfkFDclkDnV4HiqvNXWF1CCqfWYjVQKXHLdsXbcNohQZp6uFhBSTy3CN1rXTxZgOMvX0%2B71MitUnMSdRh8bxMTYi5db7Gp5CmTX%2Bmn9YyHyithhEvKByw%2BjjFT6zxbVUuGMlaxwfhvhMAxNPe0V68NmSW6qD2MJTOHe4ec6YLI%2FhlQx7akN7YCw6LLmj7Oa8vo43bi4JTF%2FQxCshhx2OxgL6UtpCqAnBhGxbfET2bmnatBHMXDmpV8mab1C4qvcOwi5P637yKigUe7eHY9qYf7yBD61xJ3kQoQKNqGS6ATAH2hxgXXDPFJVXIXfS3fC7n64u0rYP5dt4eUMMKXEsbcGOrAB4sb7VSB3JKY%2BfPkkL%2BBKvtw06rGIThhy8kCEeXzC2AlFSWBzVC%2F1WAqljcsyhi8W%2B4vsTDf2ZkJfV6mZmsbs%2FwPP10jJhQIgYT26k5yANs%2BZywrPDxv5YOyTBr46XOc3NTXduB%2Bj5%2BbAC%2BcWnq0hoGDqiK0kIPIvvopeYzaN3U3YVOKiEEE73Ec%2BO3UeyXz%2BIwhQpE3qJoacymWg8ggBPYy%2FiDCcmaTaIh2FYlB4lfo%3D&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20240919T185747Z&X-Amz-SignedHeaders=host&X-Amz-Expires=300&X-Amz-Credential=ASIAQ3PHCVTY5MOF4UWB%2F20240919%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Signature=6ff451732ac62727f002f7c7bbd1443335c73abceb4d549d02d459fad9cd23df&hash=c0b6410c9ba78e3a45da678c7bcb72e4a9ce4c24532d627e53e31b759ed9f40c&host=68042c943591013ac2b2430a89b270f6af2c76d8dfd086a07176afe7c76c2c61&pii=S030442030990055X&tid=spdf-dce573c1-c3be-4526-9275-ba550835df91&sid=268a3c3672d364486d1a84239ed49136496dgxrqa&type=client&tsoh=d3d3LnNjaWVuY2VkaXJlY3QuY29t&ua=0f1d560054010d0b0f0b&rr=8c5bcdae8a6c4d0a&cc=us

 

[Brian916]

It is curious that the pH for hydrogen peroxide is ~4.5 for a 3% solution, so we could expect to see an increase in ORP simply due to pH change. This weak acidity is partially related to the stabilizer used in most hydrogen peroxide solutions. I checked the SDS for the Swan brand USP listed 3-percent hydrogen peroxide (Stabilized) and they do not list the stabilizer, but there are a variety of potential stabilizers including: colloidal stannate (tin), sodium pyrophosphate, organophosphates, nitrate, phosphoric acid, colloidal silicate, and sodium citrate (depending on the grade and strength of the product). Tin related stabilizer are reportedly not used for pharma or medical grade. I read in several places the the most likely stabilzer is phosphoric acid or other proprietary organic acid. Long term dosing of these stabilizers is potentially problematic and should be measured for impact to water quality, but usual nutrient export methods may prevent any observable change.

A unique reduction reaction in comparing ozone vs hydrogen peroxide is that copper may be reduced in the presenting of H2O2. In the case of copper, some of the (hopefully) trace copper in the system reactes with hydrogen peroxide in a reduction reaction as follows:

Cu(OH)2 + H2O2-> Cu+ + HOO + 2(OH-) .

This reaction is temperature, pH and alkalinity dependent. Note that this reaction has formed two strong oxidizers in the form of the hydroperoxyl and the hydroxyl which will reacte with many organics in the system increasing water clarirty and maybe helping with other organics in the water column. This is a "Fenton's like" metal catalysed reaction and also occurs with iron and manganese. However, some of the copper will reacte with the hydrogen peroxide as follows:

Cu(OH)2Cl2 + H2O2 -> CuCl2- + HOO + OH- + H2O .

The copper cloride (CuCl2- ) that is formed is relatively resistant to further oxidation/reduction in the marine system. CuCl is less toxic and less soluble than Cu2+ and this reaction may be beneficial if there is a risk of excess copper in the tank water. Most of us are much more at risk for excess copper versus copper deficiency, so this is probably a good thing (just my guess). Thoughts on this?

An experiment worth trying is performing a set of ICP tests on a stable tank before and after 2 weeks of hydrogen peroxide dosing to measure the impact of metals solubility and nutients around hydrogen peroxide additions. I can probably swing a 6-pack of Triton ICP tests from BRS, but please chime in if you are aware of a better deal?

Day 1 - Stop hydrogen peroxide dosing and perform 30% water change - Collect Baseline Sample (1)
Day 21 - Operate tank per usual. Collect Baseline Sample (2)
Day 22 - Begin hydrogen peroxide dosing (0.2 ml per liter of system volume daily)

Peroxide is being dosed to the return chamber of the sump at peak of light intensity under a Neptune Sky with UV at 100% and ~320 PAR at 6-inches of depth. Daylight dosing was selected due to potential beneficial interactiuon with UV in photolysis.

Day 36 - End peroxide dosing (2-weeks). Collect sample (3)
Day 43 - Collect Sample (4)
Day 50 - Collect Sample (5)
Day 60 - Collect Sample (6)

Has this been done? Any comments or ideas?

 

[Randy Holmes-Farley]

It is curious that the pH for hydrogen peroxide is ~4.5 for a 3% solution, so we could expect to see an increase in ORP simply due to pH change. This weak acidity is partially related to the stabilizer used in most hydrogen peroxide solutions. I checked the SDS for the Swan brand USP listed 3-percent hydrogen peroxide (Stabilized) and they do not list the stabilizer, but there are a variety of potential stabilizers including: colloidal stannate (tin), sodium pyrophosphate, organophosphates, nitrate, phosphoric acid, colloidal silicate, and sodium citrate (depending on the grade and strength of the product). Tin related stabilizer are reportedly not used for pharma or medical grade. I read in several places the the most likely stabilzer is phosphoric acid or other proprietary organic acid. Long term dosing of these stabilizers is potentially problematic and should be measured for impact to water quality, but usual nutrient export methods may prevent any observable change.

A unique reduction reaction in comparing ozone vs hydrogen peroxide is that copper may be reduced in the presenting of H2O2. In the case of copper, some of the (hopefully) trace copper in the system reactes with hydrogen peroxide in a reduction reaction as follows:

Cu(OH)2 + H2O2-> Cu+ + HOO + 2(OH-) .

This reaction is temperature, pH and alkalinity dependent. Note that this reaction has formed two strong oxidizers in the form of the hydroperoxyl and the hydroxyl which will reacte with many organics in the system increasing water clarirty and maybe helping with other organics in the water column. This is a "Fenton's like" metal catalysed reaction and also occurs with iron and manganese. However, some of the copper will reacte with the hydrogen peroxide as follows:

Cu(OH)2Cl2 + H2O2 -> CuCl2- + HOO + OH- + H2O .

The copper cloride (CuCl2- ) that is formed is relatively resistant to further oxidation/reduction in the marine system. CuCl is less toxic and less soluble than Cu2+ and this reaction may be beneficial if there is a risk of excess copper in the tank water. Most of us are much more at risk for excess copper versus copper deficiency, so this is probably a good thing (just my guess). Thoughts on this?

An experiment worth trying is performing a set of ICP tests on a stable tank before and after 2 weeks of hydrogen peroxide dosing to measure the impact of metals solubility and nutients around hydrogen peroxide additions. I can probably swing a 6-pack of Triton ICP tests from BRS, but please chime in if you are aware of a better deal?

Day 1 - Stop hydrogen peroxide dosing and perform 30% water change - Collect Baseline Sample (1)
Day 21 - Operate tank per usual. Collect Baseline Sample (2)
Day 22 - Begin hydrogen peroxide dosing (0.2 ml per liter of system volume daily)

Peroxide is being dosed to the return chamber of the sump at peak of light intensity under a Neptune Sky with UV at 100% and ~320 PAR at 6-inches of depth. Daylight dosing was selected due to potential beneficial interactiuon with UV in photolysis.

Day 36 - End peroxide dosing (2-weeks). Collect sample (3)
Day 43 - Collect Sample (4)
Day 50 - Collect Sample (5)
Day 60 - Collect Sample (6)

Has this been done? Any comments or ideas?

I’m not aware of any experiment relating to metals and hydrogen peroxide or ozone in a reef tank. I think it would be very complicated to understand what is even a positive effect vs what would be a negative effect, and some effects might be both depending on the tank.

For example, if a trace metal like iron or copper declined, is that a good or bad result? It might happen from precipitation, or increased uptake by one or more organisms.

 

[Gomi's Reef]

To be clear, this is about longer term oxidizer dosing (with dose measurement and monitoring), not topical applications or dips for algae or pest treatment.

After watching a fair amount of BRS and other reef content on YouTube discussing the benefits of dosing ozone to clarify water and reduce risks of infectious bateria, I started to wonder about using hydrogen peroxide to similar effect (i know i am not the first). Naturally this became a rabbit hole of reading through threads and some literature with many emotions and anecdotes but perhaps not much science (excepting Randy as referenced below). There are several threads claiming that 10ml of 3-percent (or other small amount) hydrogen peroxide crashed a tank and others claiming that hydrogen peroxide dosing is dangerous, or pointless (maybe...). I wanted to gather any research that people have done on long term hydrogen peroxide dosing to compile a best practices for folks who are similarly curious and help answer some questions about when using an oxidizer to raise ORP might be helpful, what are the benefits or downsides of hydrogen peroxide relative to ozone, and when should we bother with hydrogen peroxide to address specific issues. If this exists, I didn't find it...but if it does, please show me the way?

According to this great article by Mr. Randy Holmes, (https://reefkeeping.com/issues/2003-12/rhf/feature/) there is questionable benefit to attempting to manage ORP with oxidizers in place of seeking to manage the underlying problems that might depress ORP; however, many folks have persisted and insist that running ozone or other oxidation methods can help manage nuisance algaes and other bacterial infestations and will help with water clarity.

The issue that got me going on this was the relative hazards related to dosing ozone:
1) Ozone is harmful to indoor air and needs to be quenched to avoid poluting your air quality
2) Ozone gas will burn many materials including the seals and tubing in a skimmer
3) Ozone is a stong oxidizer and mistakes with dosing can rocket ORP and harm the inhabitants
4) Ozone generators are expensive, are damaged by air moisture, and need maintenance and replacement.

And the potential relative benefits of hydrogen peroxide:
1) Has similar oxidation properties as ozone (albeit oxidation strength depends on concentration)
2) Does not release a harmful gas into indoor air
3) At 3-percent concentration it is much more difficult to overdose (but also a weaker oxidizer)
4) Unlikely to burn equipment except at very high concentration
5) Injection under UV lighting may enhance photolysis allowing for a stronger oxidation reaction with a weaker oxidant and a smaller UV light.
6) A gallon of 3% peroxide at Costco is usually <$10 making this a good value especially for smaller tanks .

Some questions...

-Why do people tend to prefer ozone over hydrogen peroxide?
-Are people adding peroxide to the intake of UV sterlizers or under strong UV lighting? Why dose at night instead of peak light cycle
-What are the measurable differences in using small high concentration doses of ozone versus a lower strength hydrogen peroxide dose to elevate ORP or address nuisance outbreaks in a reef aquarium?


I am a professional groundwater hydrologist with some experience in water treatment, but not a chemist or water treatment expert. With work and family balances, I am a frequently neglectful reefer and I am often looking for approaches that can give me some added security between extended water changes or those odd algae outbreaks that I am slow to address.

I don't have the background you and Randy have. I'm an immunologist but come from a background of biochem and biophysics so I can fumble my way through the science. But I'm no expert.

I am currently running a study testing the effect of H2O2 dosing on my reef tank. Because I had the exact same line of thought that you have had here.

I took baseline readings of DOC, Aquabiomics and ICP. pH and ORP are monitored in real time, and i do weekly tests for Alk Ca Mg NO3 and PO4. I will run the study for about 2 months and then take the same DOC, AB and ICP tests and compile the data and my findings.

My hypothesis was oxidation of organics should decrease DOC and increase ORP. Though I do see that typical ORP dip immediately after peroxide dosing. I also expect to see some shift in the biome either through direct effects of peroxide on the microbes but also indirectly by changing the DOC landscape too.

I'm slowly increasing the dosage now. Originally 2ml/day, currently at 4ml, eventually I will stop at 6ml daily (60g system volume).

Feel free to follow along on YT (https://www.youtube.com/@gomisreef) or DM me on instagram if you have any questions, as I'm not super active on R2R

 

[Randy Holmes-Farley]

I don't have the background you and Randy have. I'm an immunologist but come from a background of biochem and biophysics so I can fumble my way through the science. But I'm no expert.

I am currently running a study testing the effect of H2O2 dosing on my reef tank. Because I had the exact same line of thought that you have had here.

I took baseline readings of DOC, Aquabiomics and ICP. pH and ORP are monitored in real time, and i do weekly tests for Alk Ca Mg NO3 and PO4. I will run the study for about 2 months and then take the same DOC, AB and ICP tests and compile the data and my findings.

My hypothesis was oxidation of organics should decrease DOC and increase ORP. Though I do see that typical ORP dip immediately after peroxide dosing. I also expect to see some shift in the biome either through direct effects of peroxide on the microbes but also indirectly by changing the DOC landscape too.

I'm slowly increasing the dosage now. Originally 2ml/day, currently at 4ml, eventually I will stop at 6ml daily (60g system volume).

Feel free to follow along on YT (https://www.youtube.com/@gomisreef) or DM me on instagram if you have any questions, as I'm not super active on R2R

How did you measure DOC?

 

[Gomi's Reef]

How did you measure DOC?

Sent in a triton NDOC test. awating results now

 

[Gomi's Reef]

Snapshot of my ORP, and the dip that occurs rapidly after a peroxide dose. As you can see i dose small but frequently - 0.3ml every 3hours. I know others have favored one or two single doses - I am not sure whether there will be much difference in the results. But i'd rather not aggravate my corals a lot twice a day, a lower tonic level of aggravation is more my style haha.

 

[Brian916]

@Gomi's Reef I checked out your video series. You have a nice setup and I am excited to see your resuts. I will follow along and hope to gather any lessons learned on methods or analytical evaluation that I can modify for my replicate test. At some point, would you mind sharing the list of laboratory analyses you have ordered and the test kits that you are using?

WRT the ORP drop following the H2O2 dose. I am now curious about the organic acid stabilizers used in most peroxides and wondering if we aren't making a small carbon dose similar to adding vinegar or alcohol. Just a thought... I wonder if I could inert a bottle of H2O2 without affecting the stabilizer and then dose that solution to see if we get a similar ORP response.

 

[Gomi's Reef]

@Gomi's Reef I checked out your video series. You have a nice setup and I am excited to see your resuts. I will follow along and hope to gather any lessons learned on methods or analytical evaluation that I can modify for my replicate test. At some point, would you mind sharing the list of laboratory analyses you have ordered and the test kits that you are using?

WRT the ORP drop following the H2O2 dose. I am now curious about the organic acid stabilizers used in most peroxides and wondering if we aren't making a small carbon dose similar to adding vinegar or alcohol. Just a thought... I wonder if I could inert a bottle of H2O2 without affecting the stabilizer and then dose that solution to see if we get a similar ORP response.

I deliberately bought lab grade from Lab Alley rather than Walgreens/Boots/Costco use on cuts peroxide.

They say it is just water and peroxide

With no mention of stabilizers. It doesn't mean they're not there though as even their lower grade peroxides say the same.


As for inerting a bottle, not sure how that could be done short of leaving it exposed to UV light for a period of time.

 

[Gomi's Reef]

At some point, would you mind sharing the list of laboratory analyses you have ordered and the test kits that you are using?

Sure thing (hyperlinks should work)


At the start of the study - Triton NDOC, Fauna Marin ICP (I've noticed it is about to link the data direct to Hydros app, that's why I chose these guys, I may switch to their total ICP test next time my mistake here), and AquaBiomics Microbiome testing.

Real time - ORP - Bulk Reef Supply Double Junction ORP Probe & pH CoralVue Hydros Standard Probe - monitored if you hadn't guessed by my Hydros system.

Weekly - Alk (Hanna), Ca (RedSea), Mg (AquaForest), NO3(Hanna) and PO4(Hanna)

At the end of the study I'll repeat the NDOC, ICP and Microbiome tests.

I'm flirting with getting a Hydros Maven but honestly, to quote my Dad "I'm not made of money". We'll see...

 

[Brian916]

Is this Lab Alley 3-percent Lab Grade the hydrogen peroxide that you purchased? I was thinking to get the same product to replicate your work and compare the ORP response with the Swan drugstore product....but now I am even more confounded and confused.

Their website says that it is "free of any stabilizers or additives" but I looked at the SDS and it shows that acetic acid is present at a concentration <1-percent. That would mean that each dose of peroxide is also a small carbon dose.

You might check the pH to confirm. The non-stabilized version will have a pH >6 whereas the acid stabilized version will have pH closer to 4.

 

[Gomi's Reef]

Is this Lab Alley 3-percent Lab Grade the hydrogen peroxide that you purchased? I was thinking to get the same product to replicate your work and compare the ORP response with the Swan drugstore product....but now I am even more confounded and confused.

Their website says that it is "free of any stabilizers or additives" but I looked at the SDS and it shows that acetic acid is present at a concentration <1-percent. That would mean that each dose of peroxide is also a small carbon dose.

You might check the pH to confirm. The non-stabilized version will have a pH >6 whereas the acid stabilized version will have pH closer to 4.

I am lost and confused. I don't get that information from the SDS on the link you attached - https://media.laballey.com/docbuild...lab-grade-safety-data-sheet-66b0f4d50e90e.pdf

I get the same one I posted earlier.

I'm home now, but I when I go to work tomorrow I can pick up some pH indicator strips and dunk one in and test it

 

[Gomi's Reef]

Is this Lab Alley 3-percent Lab Grade the hydrogen peroxide that you purchased? I was thinking to get the same product to replicate your work and compare the ORP response with the Swan drugstore product....but now I am even more confounded and confused.

Their website says that it is "free of any stabilizers or additives" but I looked at the SDS and it shows that acetic acid is present at a concentration <1-percent. That would mean that each dose of peroxide is also a small carbon dose.

You might check the pH to confirm. The non-stabilized version will have a pH >6 whereas the acid stabilized version will have pH closer to 4.

And this SDS looks like it is 3-6% peroxide. I wonder if you have somehow stumbled on an old SDS or for a lower grade peroxide?

 

[Pistondog]

Does peroxide break up the yellowing water pigments like ozone?
That is my main reason for running ozone occasionally.

 

[Gomi's Reef]

Does peroxide break up the yellowing water pigments like ozone?
That is my main reason for running ozone occasionally.

Yes. Those seems to be the reports from users

 

[Brian916]

Does peroxide break up the yellowing water pigments like ozone?
That is my main reason for running ozone occasionally.

Yes. The water clarity change is very similar and possibly more effective with hydrogen peroxide for a given dose of oxidant.

"One of the most efficient chemical systems that is known to bleach melanin pigments consists of an alkaline solution of hydrogen peroxide"

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