Algae removal


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Hello everyone
My pond gets a lot of sun. I have plenty of plants and a UV light so my water is clear and I don't mind the algae that covers the rocks. I do however get a ton of string algae in the stream and the rocks on the water falls. Pulling it out is getting to be a lot of work. I was looking at the Aquascape ion gen. Has anyone here tried it and how did it work out? Our pond is about 1500 gallons and has koi. This will be our 3 rd summer.
 
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Jhn

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Hello everyone
My pond gets a lot of sun. I have plenty of plants and a UV light so my water is clear and I don't mind the algae that covers the rocks. I do however get a ton of string algae in the stream and the rocks on the water falls. Pulling it out is getting to be a lot of work. I was looking at the Aquascape ion gen. Has anyone here tried it and how did it work out? Our pond is about 1500 gallons and has koi. This will be our 3 rd summer.
How many fish are in the pond and how big are they? In a pond your size it isn’t going to take that many koi to cause issues. A lot here use hydrogen peroxide to get rid of troublesome algae spots in the waterfalls and streams. Algae overgrowth is a sign of an imbalance in the pond, usually too many fish in the pond that is overwhelming the biofilter.
No to the iongen while it will get rid of the algae it does it by putting copper in the water, which is acutely toxic to invertebrate life ie snails, aquatic bugs, plankton in the pond, which is the base of the ponds food web. It can also lead to dinoflagellate explosion in the pond, which can be a lot worse than the algae you are trying to cure. Try to find the source of the algae problem and fix that.
 

Mmathis

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A 1500 gallon pond with koi..... A lot of your algae problem might be due to excess nutrients. Koi are big waste producers.
 
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Hello
I have 10 koi about 6 inches long each. I test the water weekly no ammonia and nitrates near zero and zero nitrites. I do monthly 25 percent water changes and vacum the bottom of the pond bi weekly. We have a bio falls and a pondmax 7200 filter that gets back washed monthly also. Between the 2 pumps I'm moving about 8,000 gallons an hour. The fish are fed lightly mostly on the weekend. I wasn't sure about the ion gen as I was worried about the copper also. Where the water is shallow as in the stream and the water falls is my only trouble spot. I have to believe it's the sun as our yard is in full sun light with no shade. I guess I'll just have to keep removing it by hand.
 
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Do you have string algae year round? Or mostly in the spring? I get it in my pond in the spring, before the temps really warm up. It seems to go away on its own later in the season.
 
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I would say the more sun and the higher the water temperature is is when it really grows. Spring and fall it slows down. I might try the hydrogen peroxide that was recommended a few posts ago. The ion gen seems to work for a lot of people but it's a little scary for me. The koi we have are very interactive and I would hate to kill them.
 
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Jhn

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I would say the more sun and the higher the water temperature is is when it really grows. Spring and fall it slows down. I might try the hydrogen peroxide that was recommended a few posts ago. The ion gen seems to work for a lot of people but it's a little scary for me. The koi we have are very interactive and I would hate to kill them.
if you do the hydrogen peroxide thing, turn the waterfalls and stream off then hit the algae with the hydrogen peroxide.

Too much sun alone isn’t going to cause algae problems, my pond is in full sun pretty much all day as well, but I have zero algae issues other than that of the biofilm coating in the pond. My pond is heavily planted and has a bog filter, that out competes algae for available nutrients.

You should be a lot scared of putting an ionizer in your pond, checkout the article section of this forum. There is an article by Meyer Jordan on the deleterious effects of an ionizer on our ponds and the aquatic life in them including how copper bioaccumulates in fish. While it will do what It is advertised to do, there are side effects of using them.
 
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An alternative to hydrogen peroxide for algae is sodium percarbonate. It's in a powdered form - sold commercially as things like EcoBlast for cleaning waterfalls. If you buy it unlabeled, it's way way cheaper and very simple to use. I use it on my waterfall a couple of times a season, but I also sprinkle it over the entire pond in spring and it works like magic, pulling debris up from the bottom of the pond. Perfectly safe - upon contact with water it breaks down into hydrogen peroxide and soda ash. I also use it in the shallower areas of the pond to clean up the algae that can collect there.
 
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Good idea about turning the falls off. I'm definitely not going the ion gen route. Thanks for all the feedback. It's nice to come here and get help and advice.
 
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If you don’t get fish your pond will be a mosquito incubator.
You can get these floating supports for water plants so the plants can cover more water area quickly.
I tried to find a US example but amazons too ridiculously $$$.

I have wonderful memories as a child watching tadpoles grow in ponds.
 
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An alternative to hydrogen peroxide for algae is sodium percarbonate. It's in a powdered form - sold commercially as things like EcoBlast for cleaning waterfalls. If you buy it unlabeled, it's way way cheaper and very simple to use. I use it on my waterfall a couple of times a season, but I also sprinkle it over the entire pond in spring and it works like magic, pulling debris up from the bottom of the pond. Perfectly safe - upon contact with water it breaks down into hydrogen peroxide and soda ash. I also use it in the shallower areas of the pond to clean up the algae that can collect there.
how do you know how much to use
 
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Thank you all for the input.

Since I asked for help here, there have been more string algae grown in the pond. We decided to drain the pond and pressure wash it. Learned online an easy way to siphon out most of the water without having to use a pump, pressure washed the bottom, used a pond vac to remove the remaining water and refilled the pond. Now it looks much better.

I think it'll take a while for the pond to establish a nitrogen balance before I can add fish and plants. Well I did find three tiny fish there and have taken them out. Now I think I shall follow suggestions here and keep the pond clean in a less aggressive way...
IMG_2236.jpg
 

addy1

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how do you know how much to use
I used to use 1 liter per 1000 gallons of water. The sodium percarbonate I would just grab handfuls and toss in, have the net ready it makes everything float to the surface. debris wise.

I have not used since I built this pond, no string, no huge algae growth, the bog plants keep the nutrients to low for it to grow.
 
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I haven't read the whole thread but I did get to the part where you said that you didn't have fish. To me that algae on the bottom makes the pond look natural and covers the liner. But if you don't like it then drain the pond and power wash it as you suggested. You have nothing to lose except the algae and you will have a nice clean clear pond. As mentioned it will most likely return. But you can treat it like a swimming pool and brush it daily. Another option would be to give it a heavy dose of sodium percarbonate which can be found on eBay it is very effective for string algae. That should kill it but you'll still have to remove it. One thing about string algae is that it actually keeps the pond cleaner. Push it around a little and see how much dirt comes out of it.
 

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