Best Way To Clean Algae From Pond | Aquascape Addiction

Best Way To Clean Algae From Pond

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The ultimate guide on how to safely clean and remove algae from your pond, we look different algae types and the best products to help you eliminate and prevent it.

Best Way To Clean Algae From Pond

Ponds are definitely very beautiful things to have in your backyard. All of those fish and plants add a very nice touch of serenity no matter where the location. However, there are things that can negatively affect the look of your pond, with algae being the most prominent one.

The problem with algae is that it can be quite hard to control, to prevent, and to remove, especially when outdoors. However, that is why we are here today, to help you find the best way to clean algae from pond (this product is our top pick). We are going to tell you everything we know about this topic so you can keep algae out of your pond.

Aquascape IonGen System For Ponds Up To 25,000 Gallons 9.5/10
TetraPond Control Pond Block Simple But Effective 9.4/10
API POND ALGAEFIX Easy To Use 9.4/10

Identifying Pond Algae

There are a few different types of algae out there that are normally found in ponds. Some are easier to spot and to control than other. However, with these few descriptors, you should be able to properly identify the algae in your pond.

Filamentous Algae

This is probably the most common type of pond algae that you might encounter. This stuff looks like green hair, really thick green hair, that is most often found at the bottom of the pond, usually attached to the substrate, wood, or rocks.

Filamentous algae is known to break off from its place of growth and float to the top of the pond in the form of large green matts.

Oscillatoria Algae

This is actually also a type of filamentous algae, but it looks a little different. The hairs are not as thick or pronounced as with classic filamentous algae, plus this stuff tends to be a little slimier.

Also, Oscillatoria algae tend to be a little darker in color, looking to be bluish-green or even black. This stuff is well known for giving ponds a black or purple tint.

Chara Algae

This type of algae can be a little hard to identify as it actually looks like a plant or pond weed. It is green, leafy, and grows in large pillow-like formations, making it hard to distinguish as a type of algae.

Chara algae will never grow above the surface of the water, it has a really musky scent, and it features a crunchy texture too.

Planktonic Algae

This stuff is also very hard to identify as it is so small that you can’t see it without a microscope. Well, you can’t see it in small quantities anyway, but when it turns the water a pea green color, plus when it makes the water all slimy on the surface, you will know that you have planktonic algae in your pond.

The Best Pond Algae Treatments

If you want to remove algae from your pond and you want it to happen right now, you might want to check out one of the below products. As far as we are concerned, the below products are all great ways to control algae.

These are in our opinion some of the best pond algae treatments out there at this time, so give them a closer look if you have a serious algae problem.

1. Aquascape IonGen Algae Controller

Now, this thing is definitely quite the innovation in science, which is totally awesome, but we are not about to explain the exact process here. It is quite complicated, not really worth explaining, but it works well (you can check the current price here).

What is not complicated however is using the Aquascape IonGen Algae Controller. It can be installed right into the main water feature’s plumbing and it just needs to be plugged in for operation. It’s quite easy to use which is a big bonus as far as we are concerned.

The main point to keep in mind here is that the IonGen Algae Controller is made of a block of materials that include copper ions. This thing releases copper ions into the water which in their own special way help to completely kill algae and stop it from blooming.

This Algae Controller can be used for ponds up to 25,000 gallons, which is very impressive indeed. It comes with a control panel so you can monitor the level of ionization occurring, which is the amount of copper ions being released into the water. We do like the electronic control panel because you can see exactly how much copper is being released and how much time the probe has left before it needs replacement.

Depending on how heavy your algae problem is and what level you have this thing running at, the copper probe could last for up to 3 seasons, but also as little as 1 season. You can set the ionization level as needed depending on how bad the algae problem is. You should keep in mind that this Aquascape IonGen Algae Controller is best used for string algae control. It works for other types of algae too, but not quite as well.


  • Great for controlling string algae.
  • Lasts for a very long time.
  • Is very easy to install and use.
  • User friendly control panel.
  • Tells you when it needs to be replaced.
  • Works for very large ponds.


  • Does not work so well for types of algae other than string.
  • You need to periodically test the copper levels in the pond water as too much copper in the pond can harm both plants and fish.

Click here to check the price at Amazon

2. TetraPond Algae Control Block

Ok, so this stuff has a big upside, which is the fact that each block can effectively treat up to 250 gallons of pond water with ease, plus you get 4 blocks in a package. It takes about a month for a block to dissolve, so for a 1,000 gallon pond, one package would last a little over a month (you can check the current price here). The big upside we are talking about is that this stuff is great at killing pretty much every type of algae that you might find in your pond.

The TetraPond Algae Control Block is extremely effective at its job. There is just no denying that. Now, with that being said, the main ingredient here is copper, so you will need to test the water regularly. However, that is not the big disadvantage we were talking about.

These things cannot be used in ponds that have live plants. Chances are that the TetraPond Block will kill your live plants. At the same time, if you fail to follow proper dosage instructions, this stuff could very well kill your fish too. So, in essence, this stuff is extremely effective in terms of algae control, but can also be dangerous to your fish if used improperly, plus it is not good for plants either way.


  • Extremely effective at killing most kinds of algae.
  • Lasts for quite a while.
  • Very easy to use.


  • Cannot be used in ponds with real plants.
  • Dosing instructions need to be followed carefully, or else your fish may be hurt.

Click here to check the price at Amazon

3. API Pond AlgaeFix

In our opinion, this is one of the better, easier and safer options to go with in terms of algae treatment and control. This particular one is a simple 1 gallon container with the dosage instructions included (you can check the current price here).

All you need to do is add the appropriate amount of API Pond AlgaeFix in terms of the total water volume in your pond every 3 days until the algae problem is fixed. You can then use API Pond AlgaeFix once per week to prevent algae from coming back.

Now, you do need to keep in mind that following the proper dosage instructions here is vital to the success of this endeavor. If you use too little API Pond AlgaeFix, it won’t work to get rid of all algae. However, if you add too much of it, it can kill your plants and fish, so be careful when using this stuff. That being said, API Pond AlgaeFix works to kill pretty much every single type of algae that you could ever encounter in your pond, which is of course a big benefit no doubt.


  • Very easy to use.
  • Lasts a long time.
  • Great for controlling most kinds of algae.


  • If too much is used, it can be dangerous for plants and fish.

Click here to check the price at Amazon

4. AlgaeOff

This stuff is also very simple and straightforward. The whole container of AlgaeOff can treat up to 1000 square feet of water, which is admittedly not all that much. You need to use about ¼ cup of it to treat 50 square feet of water. Keep in mind that this stuff is really best used for surface algae such as floating string algae.

While it will mix into the water and kill algae at the bottom of the pond, it is much more effective for algae growing on the water’s surface. AlgaeOff is advertised as being used to treat green water and green string algae, so we honestly are not too sure about other types of algae. That being said, AlgaeOff is totally safe for plants, fish, and pets as long as the proper dosing instructions are followed.


  • Kills string algae on contact.
  • Very easy to use.
  • Safe for pets and fish.


  • Can be harmful if instructions are not followed closely.
  • Does not work for algae other than string algae.

Click here to check the price at Amazon

How To Remove Algae From Pond Without Harming Fish

First and foremost, you definitely do not want to harm the fish in the pond when removing algae. Luckily, there are many ways of removing algae from your pond without harming the fish living in it.

These are all methods that we are going to discuss in detail below. For now, let’s just make a quick bullet list of all of the fish-friendly ways that you can remove algae from your pond and prevent it from coming back.

  • All of the products we have reviewed are totally fish friendly.

  • Having a really strong biological filtration unit will remove nutrients needed by algae.

  • Making sure that you have a strong filter and an ideal pump helps a whole lot.

  • Blocking out sunlight with natural cover helps stop algae blooms.

  • Using a UV sterilizer to neutralize UV rays will help a lot.

  • Using some kind of pond dye to darken the water will prevent too much sunlight from feeding algae.

  • Cleaning the pond regularly and engaging in water changes are both things that help control and remove algae without harming your fish.

  • Make sure to not overstock the pond or overfeed your fish, as these are both factors that contribute to algae growth.

  • Adding the right pond plants will help take nutrients out of the water which would otherwise be used by algae.

How To Get Rid Of Algae In Pond Naturally

No matter what type of algae you have in your pond, you are obviously going to want to get rid of it. Now, chemicals and other such algae treatments work just fine. However, you might be concerned about adding any kind of chemical into the pond, which is understandable.

Luckily, there are some natural pond algae treatment methods that you can try. Now, keep in mind that when used alone, these natural remedies might not work that well, but if you use them all together, they should be quite effective.

Clean The Pond

One of the best things to do is to clean out your pond. This means going around with a net and cleaning out any debris that you may find. First and foremost, try to scoop up as much algae as you can. If they are matts of algae or long strings, you should be able to remove a fair amount of it by hand.

Moreover, you should also remove all kinds of rotting plants, dead fish, decaying food, and any other organic matter that is past its prime. Once these things start to decay, they all provide nutrients which algae use to grow. Removing the algae’s food sources will definitely help control it.

Do Not Overstock Your Pond

Another natural way to get rid of algae and to stop it from coming back is to not overstock the pond. Fish eat a lot and they produce a lot of waste. So, the more fish you have and the more you feed them, the more waste they will end up producing.

The ammonia and other substances present in fish waste, plus in rotting fish food, is a nutritional smorgasbord for algae. So, keep the number of fish you have in the pond to a conservative number. This way you won’t be providing the algae with too much food.

Regular Water Changes

Perhaps one of the simplest ways to remove algae from the pond and prevent its return is to engage in regular water changes. You can change as much 30% of the pond water, and replace it, per week.

For one, this will help remove some algae from the water directly. However, the biggest benefit here is that changing the water automatically removes many of the nutrients which algae needs to grow. You could actually use this pond water for your lawn or garden, as it will help your plants grow quite well.

Add The Right Pond Plants

You should definitely have a good mix of pond plants present in your pond (we have covered our favorite plant picks over at this article). First off, you want to have some floating plants, quite a few ones with broad leaves. These help to block out UV light and the sun’s rays, which help algae grow.

Second, you want to have some bushy submerged plants underneath the surface of the pond. Having a few good and fast growing plants present in the pond will help to reduce the amount of nutrients present in the water which algae require to grow. This is not a surefire solution, but generally speaking, the more of these plants you have, the less algae will grow in the pond.

Natural Cover

The other thing that you can do to help prevent the growth of algae in your pond naturally is to provide the pond with natural cover. Algae need a lot of sunlight to grow and multiply.

Therefore, if you have a bunch of trees or buildings providing your pond with a fair amount of shade, algae levels will be drastically reduced without a shadow of a doubt. This method is best used with the other above methods that we just talked about.

Other Things To Consider

There are a few other things that you can consider in terms of algae prevention and algae removal. Yes, using all of the above methods in combination with the ones we are about to talk about will definitely help to eliminate most, if not all, algae from your pond.

Like we said, algae can be a tricky thing to deal with, especially when it comes to an outdoor pond, so using a combination of methods is usually best.

Use Helpful Additives

Using the right additives in your pond can definitely help to control algae. Mainly, we are talking about the ones we have listed above. The various algae killers we have reviewed above are quite honestly the best and fastest ways to go about removing algae from the water.

Things like beneficial bacteria can help a whole lot because they remove the food sources which algae need to grow.

Water Dyes

One big thing to go with if you want to remove and control algae in the pond is to use pond dye. Pond dye comes in a few different colors including black, blue, and green. All of these help to darken the water and thus block sunlight from penetrating into the depths of the pond.

Since algae need a lot of sunlight to bloom and multiply, limiting the amount of sunlight that penetrates deep into the pond will help quite a bit no doubt.

Is Your Pond Pump Right

Another thing to keep in mind here is that you need to have a good pond pump and a good biological filtration unit set up. The pump and filter you have should be able to process the entire volume of the pond every single hour.

Ideally, the more water your pump and filter can process per hour, the better. You want the water to be in contact with the biological filter a whole lot in order to remove solid debris and things like ammonia which feed algae.

Use A UV Sterilizer

UV sterilizers are quite simple tools to use, plus they are really not all that expensive. We are not going to get into the science of it here, but the important part to note is that UV sterilizers work to sterilize and neutralize UV rays which would otherwise help algae grow.


As you can see, while algae might be quite the problem in outdoor ponds, there is a whole bunch of different ways to remove it and to prevent it from coming back. We would obviously recommend going with one of the products that we have reviewed.

However, using the other methods we have described in combination with these algae killers is what will work the best. The best way to kill algae in a pond is by combining as many of the above methods as possible.