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Thread: To Use Or Not To Use Hydrogen Peroxide For Algae Control???

  1. #1
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    To Use Or Not To Use Hydrogen Peroxide For Algae Control???

    I am inquiring to see what everyone thinks and or feels about using 35% Hydrogen Peroxide for the help of controlling algae? I would like to know what you think about the use of this instead of some of the other very costly additives.
    Thanks,
    Frogger

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  3. #3
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    Quote Originally Posted by Frogger View Post
    I am inquiring to see what everyone thinks and or feels about using 35% Hydrogen Peroxide for the help of controlling algae? I would like to know what you think about the use of this instead of some of the other very costly additives.
    It absolutely does work... BUT... (<--- there is always a butt)

    Be careful in your dosage! If you decide to use more than suggested, you're going to do alot of long-term damage. Hydrogen Peroxide seemed to be a big thing last year for some reason. We ran across quite a few people using it in excess. Think of it as a shock treatment... yes, it will kill algae...and bacteria...and enzymes...you get the point, but then you can expect major blooms of algae within a week after if no other action is taken. When evaluating ponds treated with excess H2O2, I witnessed stunted aquatic plant growth and signs of miniature ecological disasters. There are just too many "ifs" when it comes to using this product unless your working with assistance or have experience.

    As with anything else, its always a balance. H2O2 is very cheap to purchase and has benefits, but in strict moderation.
    Dan Dumas


    Waterscape & Landscape Construction Specialists
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  4. #4
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    Most does are for 3%, not 35 % so use caution with the stronger one...it is an oxdizer and will burn the fish if the dose is blown.

    Yes this can be done with fish in the pond. Two quarts of 3% hydrogen peroxide is the relatively "safe" limit of peroxide use if the peroxide is not quickly consumed by the algae, if there is lots of algae to quickly consume the algae, a higher dose can be used.

    Sodium percarbonate is cheaper as a source of hydrogen peroxide than 3% hydrogen peroxide from Wally World. But the hydrogen peroxide from Wally World will not drive the pH us like the sodium percarbonate.

    Hydrogen peroxide is also freely available in gallon bottles from internet orders at 35% hydrogen peroxide concentration, and that is about a factor of 2 cheaper than 3% hydrogen peroxide from Wally World for the same amount of active hydrogen peroxide. But the higher strength does require regular relief of the pressure buildup, or to be stored in a refrigerator. If stored at room temperature without pressure relief, the bottle eventually "blows" from the pressure buildup. Then it is a mess to clean up as I did in my basement last year, turns your skin white if you get much of that 35% stuff on you during cleanup...''

    ''...Drop the dose of the 35% a factor of 10 from the 3% dose. Meaning if two quarts or 2000 ml per 1000 gallons were being used as the dose rate for 3% peroxide, use 200 ml or about 3/4 of a cup per 1000 gallons of the 35%....''

    Dr Roddy Conrod

  5. #5
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    Matt,
    Just this last month I used Pond Care's Algaefix which is safe for both fish and plants. It worked amazingly well throughout the pond even destroying algae that was on in-water large pond stones!

    Westlake Ace Hardware on Beltline here in Desoto stocks Alagaefix in two bottle sizes along with a wide variety of other Pond Care brand products.

    Louis

  6. #6
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    Ive used it too and was very pleased with it...fish fine, plants fine...algae not!
    The earth really does "laugh in flowers".

  7. #7
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    Brightly,
    Which did you use? Was it the Hydrogen Peroxide or the Pond Care's Algae-Fix?
    Thank you.
    Frogger

  8. #8
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    Quote Originally Posted by CypressPoint View Post
    Matt,
    Just this last month I used Pond Care's Algaefix which is safe for both fish and plants. It worked amazingly well throughout the pond even destroying algae that was on in-water large pond stones!

    Westlake Ace Hardware on Beltline here in Desoto stocks Alagaefix in two bottle sizes along with a wide variety of other Pond Care brand products.

    Louis
    A lot of fish have been killed using Algae-fix...pond volumes have to be know and it can't be overdosed...I wouldn't recommend it to my worst enemy

  9. #9
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    Quote Originally Posted by Graham 83 View Post
    A lot of fish have been killed using Algae-fix...pond volumes have to be know and it can't be overdosed...I wouldn't recommend it to my worst enemy
    Matt,
    Graham makes a very good point. I was remiss in not saying that knowing the specific capacity of the pond is vital. As I have learned in these past 12 years over dosing a pond can have tragic results. I was even more remiss since the only fish in pond are Gambusia's and possibly two sunfish.

    Matt, Graham is a very knowledgeable pond keeper and if he does not recommend a commercial algaecide that you may want to heed his advice. As for other methods to control algae, up until this year I have always used a UV filter working along with my bio filter. Unfortunately my UV gave up the ghost hence my turn to chemical treatment.

    Thanks for speaking up Graham.
    Louis

  10. #10
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    I am using a Grande Skimmer, a Mega waterfall weir, bio-balls, and a Pondmaster 4000UV. That is the basis of the filtration. I also have 7 different Hardy Lily's, and a couple of anacharis. I am using 2 Aquascape 7500 pumps to pump the water. One pump is used for a 45-50 foot meandering stream with several different sized and textured stones that also aid in filtration that flows into the metered 6200 gallon pond. I am using the other Aquascape 7500 to run the water through the Mega Waterfall weir with several filtration pads, carbon, and bio-balls. I forgot to mention that I am using a Aquascape 3000 for the Pondmaster 4000UV filter as well. I have all of this running continuous 24 hours a day and 7 days a week.

    I have not ever had any problem with green pea-soup water. The problem that I encountered was the String Algae that would stick and was slimy on all that it was able to re-seed onto. I got it cleaned out now and have been using the Aquascape's Aquaclearer Extreme to help aid in the biological process and it has also helped in removing a little bit of string algae that showed back up. I have also used some SAB in conjunction with the Aquaclearer Extreme. With these two chemicals being used I was wondering which one was helping to aid in the string algae that re-appeared to be gone. Is it a combination of both chemicals working together or is it more one over the other????

  11. #11
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    Sounds nice...just how long is this hair algae...........if it's the short fuzzy kind that's fine. Having pristine clean rocks and gravel isn't realistic....

    Have you checked to see what the iron and phosphate levels are in the water? If these are high you can dump all the stuff you want in there and it probably won't help.

  12. #12
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    I will check the water quality and get back with you on it. Thank you so much for all of the valuable advice and help. I have never been in the position where I want to keep dumping money in the pond for nothing. I am frugal. I do not mind having nice things and spending for them, just do not want to be wasteful and throw money down the tubes. (Literally) LOLOL
    Matt

  13. #13
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    Here are the results of my water tests:

    Nitrate-0

    Nitrite-0

    Hardness-0

    Alkalinity-High or 720

    PH- 8.2

    Any information based off of these results will be greatly appreciated. Thank you so much,
    Matt

  14. #14
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    Hi the numbers don't make sense.....with a KH of 720ppm there should definately be some GH...are you using dip sticks?

    Also very unusual to have zero nitrate.....

    Take a sample of your water to a local pet store and have them run all the tests

  15. #15
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    I used the EcoSystems ECOSURE Test strips from aquascape. They are a 5 in 1 dip test.

  16. #16
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    I used the hydrogen peroxide (H2O2) trick (it is almost like magic!) twice last year and once this year. Basically, the dosage is 1 bottle (500 mL) of 3&#37; drugstore concentration per 100 gallons of water. I only do it in the spring as things start to bud out again - all winter long (no ice here) I harvest string algae by hand. Once the water warms, the string algae tends to disappear anyway; I just use the H2O2 to make sure it's gone gone gone and the pond is presentable for my April birthday. This is the second year for my pond, and I have added NO chemicals except for the H2O2 since last summer. I do not own a UV system. No spring algae blooms, no cloudy water - lovely!

    As a chemist, I must warn against anyone with no experience handling 35% H2O2. This stuff is not only dangerous to the handler (chemical burns, bleaching), but can be a flame accelerator! If spilled on a fuel (paper, oil, wood shavings) it can spontaneously ignite, or just smolder enough to set off fire alarms. I would highly recommend diluting H2O2 of this concentration before adding it to any living system.

    Sonoma County Susan
    Science Teacher, Ponder (Zone 9)

  17. #17
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    Chemist,
    Thank you for the response. How do you feel about the results of my readings from my pond? I am just trying to find out what is going on and what is going to be the very best continual plan of action? Any comments or suggestions are greatly appreciated.

    My biggest concern is that I do not want to have to battle the string algae in large amounts if can help it. That is my biggest concern. What to do to help the string algae to a minimum. Thank you for any suggestions or knowledge.
    Matt

  18. #18
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    Quote Originally Posted by Frogger View Post
    I used the EcoSystems ECOSURE Test strips from aquascape. They are a 5 in 1 dip test.
    Matt test strips are really inaccurate, even high humidity can mess them up.

    Just to give you an idea about your results....Alkalinity is a measurement of carbonates and bi-carbonates in the water, it's another way to express KH. It's what buffers the pH, hence your high pH number.

    But carbonates don't exsist by themselves but are usually combined with another element usually calcium....calcium carbonate is limestone and most water in the Southern US has been filter through natural limestone formations.

    Now calcium is one of the two elements that are measured for a GH reading, the other is magnesium and you show no GH.........prefect soft water....that's not possible.

    G

  19. #19
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    Frogger, if you're concerned with string algae because you've been fighting it all winter, fret not! It should disappear as the water warms. Keep harvesting by hand, and one day it simply won't grow back again. But be warned - it will be back in full force next winter, as the water cools and the lilies die back. Even those with iced over ponds report string algae that has grown slowly all winter.

    Sonoma County Susan
    Science Teacher, Ponder (Zone 9)

  20. #20
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    Chemist,
    My main concern was the string algae. Everything else is under control. Would you use anymore chemicals or would you just leave it alone. I do not want another problem with the pond for awhile. i do not mind using chemicals, but do not want to use them for nothing. Nothing is worse to me than waste. Whether it is money or chemicals, I do not want to do things wastefully. thank you for your insights.
    Matt

  21. #21
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    At this point, I'll use no more chemicals. The peroxide cleaned up the last of my string algae in mid-April, and it has yet to return. It will be back later in the fall, I'm sure. Since the lilies came out, it's been clear sailing! They are demons for sucking sustenance from the water, starving out the algae.

    Sonoma County Susan
    Science Teacher, Ponder (Zone 9)

  22. #22
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    i have used the green clean algaecide which is a hydrogen peroxide product.

    my pond is 30,000 metered gallons.approx 30x50 with a 10 x 10 bog and a stream approx 25ft.

    the green clean has been a godsend! i do not have fish but there has been no detrimentral effects to frogs or plants.

    you do have to pick out the dead algae that remains but the bulk of it loosens up & floats into the skimmer within 24-48 hours. i used it this weekend and once again my stream and pond is algae-free.

  23. #23
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    Frogger:

    Is the string algae in your pond or in the stream? If it is in the stream, what I have found works for me and is VERY cheap is to remove most of the algae mechanically. Then shut off the pump feeding the stream (plug the overflow in your skimmer with a washcloth and you won't lose any water as the stream empties into the pond) and use a garden sprayer to spray the now exposed gravel and rocks in the stream (not just the string algae but do give the SA a good coating) with 3% H2O2. I would dilute down to 3% as the 37% would be scary to me under pressure. Please use eye protection, even with the 3%. I repeat treatments about once per month during the spring and the string algae does not stand a chance. The advantages of doing it this way is you do not subject the inhabitants of the pond to any oxidizers and it is way cheaper than treating the entire water volume to concentration level that will destroy SA.

    You will actually see the HP working as the algae will start to foam. Let it sit for about half an hour and then turn your pumps back on. The stream will remain clear for at least a couple of weeks before SA starts to take hold again. As summer starts, I can reduce or eliminate this treatment. Let me know if you try it, AFAIK, you and I would be the only ones doing this!

    Steve

  24. #24
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    Steve,
    The crazy thing is that the stream is clear and the pond is where I have had the problem. I had a little bit of string algae coming back in the pond the next day after it was cleaned. it was emptied, pressure-washed and thouroughly cleaned. I have only been using Aquaclere Extreme since the cleaning. i have not used anything else or done any water changes in now approximately 10 days. What is your recomendation. thank you for any suggestions. By the way i have noticed some green algae coming up on the falls and on the bottom gravel as well. Just a little bit.
    Any suggestions from anyone will be greatly appreciated. I am on the Nort thexas pond tour on June 7th and 8th. I want it too look really nice for this.
    Thank you in advance,
    Matt

  25. #25
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    Matt,

    My pond and stream/waterfall are in full sun all day long. I had an extreme problem with string algae up untill about 5 days ago...I never did anything. The weather here in central PA just now became warm and as a result my plants are just now begining to take off. The only thing I can figure is that the plants are sucking up all of the available nutrients that had been in excess before. Thus starving the algae.

    I now only have two tiny(maybe 1 square inch each) patches of string algae & I believe they're shrinking...

    So here's my question/advice for you...how many plants do you have in your pond? Could you increase the number in an attempt to use up the excess nutrients?

    -Jon

    My Pond - June, 2009 - Remodeling

    Adding a small "bog-like" upflow filter and
    improving the waterfall/stream.
    ---------
    The Only Difficult Questions Are Those Without Answers...

  26. #26
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    In the pond itself, you have to treat the water column. The problem with SA is that it likes good water quality just like our fish, so it is particularly hard to get rid of. If you want to use H2O2, then I suggest the easiest and safest way is to use Sodium percarbonate powder. I get mine from www.chemistrystore.com . Read the famous thread over at Koiphen-probably the most popular thread ever over there!!!

    http://www.koiphen.com/forums/showth...m+percarbonate

    I used this last spring and it worked great! Since then I have only had it show back up in the streams, of course, the koi will get any that shows up in the pond areas now!

    Steve

  27. #27
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    beware pH

    I used sodium p as Green Clean a couple of years ago...worked well and then my pH leapt to 11. This is a common side effect.
    Now I stick to peroxide if I have to use anything.

  28. #28
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    Hydrogen peroxide is also freely available in gallon bottles from internet orders at 35% hydrogen peroxide concentration.

  29. #29
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    if you're near Costco, it's about 79 cents a quart. Two quarts in my 300 gallon pond every 3 weeks or so keeps the SA to a level where I can easily pick out what remains, but ya wanna know something? When we bought this house 7 years ago, the pond worried me to death. I would never have installed one, given the choice. Now, after 7 years I am much more relaxed I cleaned it yesterday sort of, today I can see some leaves and mud on the bottom, but that's where the fish hide during the winter , as they have little plant cover now. They're happy, I'm happy. And after 3 weeks of clear water, DW is happy!
    Last edited by Bosox; 11-29-2012 at 06:29 PM.
    Ken

    Whom the gods would destroy, they first give a pond.



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