The Goplus Pressure Bio Filter is the best pond filter for the value you get from it.

It’s a wonderful feeling.

Listening to the water in your pond and watching the fishes swimming in it.

You went ahead and got yourself a pond pump that gives you a beautiful waterfall. And it helps keep your pond free from algae and scum.

But there’s an important part of the pump you need to think about. That’s the pond filter which does the heavy duty work of keeping the pond clean.

Let’s take a look at the best pond filter you can buy to keep your pond in the best condition possible.

Product Rating Price
Goplus Pressure Bio Filter 1
OASE BioSmart 5000 Pond Filter 2
CNZ All-in One Pond Filter System 3
XtremepowerUS VD-21559EP Pond Filter 4
Best Choice Products 4000L Pressure Bio Filter 5

What is a pond filter?

A pond filter usually takes the form of a small and enclosed “box” or “canister.” This device is then hooked up to a pump so that water can be pushed through the filtering mechanism.

Ease of setup and assembly will vary from one model to another. Many of the better filters have special features like a little light that tells you when it’s time to clean the filter.

What are the different types of pond filters?

Because this is such a simple device, many variations exist across different brands and styles. For instance, you will need to decide if you want a submersible filter or an in-line filter.

I would recommend choosing a filter to match your existing pump. There are a few models that include a built-in pump, but most do not. If your pump is submersible, your filter should also be submersible. The same rule applies in reverse.

Do you need a pond filter?

If you have a pond, you’ll need a pond pump and filter. That helps keep your pond clean from algae and scum that collects over time.

The filter will keep pumping clean water that is healthy for your fishes and aquatic life. And it’ll keep odor away from the pond.

How to choose the best pond filter

There are some factors that can help you make the best decision when buying a pond filter.


The first thing to consider is the size of your pond. Too small of a filter will result in green or cloudy water, defeating the entire purpose of this device. Too large of a filter will simply be a waste of money.

Also, you need to consider the size of your pump. If your filter is too big for your pump, the pump will be forced to work much harder to push the water through the filtering medium. This will eventually burn your pump out.

If your filter is too small for your pump, the water will be pushed through the filter at an abnormal rate. This means that more dirt and debris will be able to push through, and it will also cause your filter to wear out more quickly.

You need to figure out how many gallons of water your pond holds. Obviously, this will be an approximate number, but that should be good enough in this case. You simply take the length of your pond (in feet) and multiply it by the width. Next, take the result and multiply it by the depth. This will tell you roughly how much water you have.

If you have already bought a pump, you should use this formula to make sure that your pump is optimal for your pond size as well. If not, read our other article on the subject to learn a little bit more.

UV clarifier

You should look for the presence of a UV clarifier. Most of the better models have this feature, as it adds an extra level of purification.

UV light has been well-proven to have some very positive effects on water and air. The science behind this is not yet fully understood, but it seems to work. Here is a patent for a dental apparatus that uses UV light to purify air and water for sterile use.

Ease of access

Another thing to think about is the fact that you will occasionally have to clean this device. Even if you see a device that claims to be self-cleaning, bear in mind that these filters will still require manual cleaning, though it will be a rare need.

A good filter canister should be easy to access without compromising the integrity of the casing or its ability to resist water.

Indicator light

A lot of the better models of pond filter will have an indicator light that lets you know when it’s time to change the filter. This is an extremely handy feature, and some would say it is a must. The convenience and time-saving of this feature will pay for itself pretty quick.


You should also consider whether or not a certain pump will be compatible with your existing hardware. If you haven’t bought much of anything for your pond as yet, you may not have anything to compare.

So, plan out exactly what kind of components you intend to use and make sure they will fit together properly.

Many first-time pond builders have reported difficulties with getting hose fittings to match up. This is an especially large problem on foreign-made models which are often made to different standards.

Precautions when using a pond filter

There aren’t really any safety issues with these products, except for the fact that you are using electricity near water. Those who are a little more on the paranoid side may choose to avoid submersible pumps to minimize this risk.

Most of the filters that we will talk about today have an indicator light that tells you when the filter needs to be changed. Since this is powered only by a small battery, there is no real electrical hazard to you or your fish from this device.

So, since we don’t have any safety hazards let’s talk about a precaution that is meant to ensure the best results.

If you have a lot of fish, you may need something bigger. More fish means more fish poop. More fish poop means more debris for the filters to remove. This means that you will end changing the filter more often than normal. To remedy this problem, just upsize a little bit.

How to use a pond filter

Filters are generally easy to set up and use. You will need to know two things: which valve is for the intake and which valve is for the output.

Dirty water is meant to go in one valve, and clean water comes out of the other valve. All you have to do is figure out which is which. With the right hoses, it’s a snap.

Pro Tip: If your hose is just a tiny bit too big, you can get a hose clamp and tighten it down to seal the leak.

If your filter has a filth indicator, install a battery and make sure the light comes on. Then, take your filter cartridge and put it into the housing if it isn’t already in there.

Even if the filter is inside the housing, you should check and make sure that it isn’t wrapped in plastic. Refer to your product manual for instructions on how to properly add the filter to your model.

Small variations make it impossible to give you one set of instructions that will fit all models.

Maintaining your pond filter

Changing the filter is the most frequent task you’ll do with a pond filter. It’s hard to predict exactly how often you will need to change your filter because this will vary immensely from one setup to another.

Determining factors include different pond sizes, different filter sizes, the amount of fish and the fact that some filters are not as good as others.

In addition, you will need to occasionally change the battery for your indicator light if your unit includes such. The main indicator light will tell you when the battery needs to be changed. In some models, the device will alert you when the battery is low and needs changing.

Every once in a while, you should take your filter apart and give it a good deep cleaning. This doesn’t need to be done very often, two or three times a year would probably be enough. Over time, various deposits will build up in the device.

These filthy “leftovers” can eventually clog up the works and make the whole thing die if they build up to a sufficient level. You can greatly extend the life of your device by keeping it as clean as possible.


Goplus Pressure Bio Filter
  • celled algae by reducing its ability to reproduce. It is suitable for improving the water quality to provide a clear and healthy pond for your fish.
  • suitable for ponds with normal fish load 2500 gal and ponds with heavy fish load 1500 gal. With such powerful capacity.
  • made of high quality material and the outer covering is high strength, which is durable and waterproof. You can place it on the shore or underground. It can be used for a long time.

Last update on 2024-06-14 // Source: Amazon Affiliates

The Goplus Pressure Bio Filter comes with UV bulbs. This helps reduce single-celled algae in the water. This helps keep your pond clean and the fish healthy.

This can handle ponds that hold up to 4000 gallons which makes it a strong filter. The outer covering is made with high-quality material that is durable and waterproof.

This filter can be used as inline or submersible.

The Goplus Pressure Bio Filter can be used to draw water as well as filter it from bacteria.

The filter is easy to set up and use but it’s hard to get good support if you need. The automatic cleaning function helps you save a lot of time.

Pros Cons
  • UV bulbs present
  • Can handle up to 4000 gallons
  • Can be inline or submersible
  • Easy to set up
  • Automatic cleaning function
  • Hard to get support

OASE BioSmart 5000 Pond Filter
  • Innovative Flow-Through filter design with biological and mechanical filtration provides maximum oxygenation.
  • BioSmart 5000 is suitable for ponds up to 5,000 gallons (with no fish).
  • High-surface area filter foams provide exceptional biological filtration capability.

Last update on 2024-06-14 // Source: Amazon Affiliates

The OASE BioSmart Pond Filter is capable of handling ponds with up to 5000 gallons. It has a flow-through filter design that provides maximum oxygenation.

The built-in cleaning indicator helps you know when the filter needs to be cleaned. It also has a water temperature display that is useful to know the temperature.

The sludge drain helps remove the debris with ease so you don’t need to manually unclog the filter foams.

The OASE BioSmart pond filter has UV filtration to help filter impurities out of the water.

Some users have found that the outgoing outlet is a bit flimsy and could break.

Pros Cons
  • Can handle up to 5000 gallons
  • Flow-through filter design
  • Built-in cleaning indicator
  • Water temperature display
  • UV filtration
  • Flimsy outgoing outlet
  • Poor instruction manual

CNZ All-in-One Pond Filter System
  • Reduce algae, Clean Pond water
  • 3 Fountain Water Feature Attachments
  • Adjustment valve for regulating flow to fountain head and/or auxiliary water feature.

Last update on 2024-06-13 // Source: Amazon Affiliates

The CNZ pond filter system comes with a 13-watt UV sterilizer that helps remove algae and bacteria from the water.

It has an adjustment value that can be used to regulate the water flow to the fountainhead.

It has a large coarse filter foam that filters debris and bacteria from the water with the three biofilter media baskets.

The filter is designed to be run submerged so you don’t have to worry about it being visible near the pond.

It’s easy to access the filter media areas for cleaning by just removing the clips on opposite sides of the filter. Though it does take more time due to the thick filter.

It’s nice to have the three fountain attachments that can be used for a variety of displays in the pond.

Pros Cons
  • 13-watt UV sterilizer
  • Adjustment valve to regulate water flow
  • Large coarse filter
  • Three fountain attachments
  • Easy to access filter media
  • Takes time to clean due to thick filter

No products found.

The XtremepowerUS pond filter comes with a 13-watt UV light that helps clean bacteria and algae from the pond.

It can handle water up to 4000 gallons in the pond. It is an external filter and is not submersible.

Setup is really easy, and the stepped-down ends make this device able to accept multiple hose sizes. It has a cleaning indicator light that is useful to know when it’s time to clean the filter.

The whole thing weighs about 17 pounds. Not too hard to get apart, and doesn’t require cleaning very often. The bio-filtration is also a nice touch, and this product seems to get good reviews in general.

As a final note, this filter is made in such a way that it can be half-buried in the ground. This makes it easy to hide behind a bush.

Pros Cons
  • 13-watt UV sterilizer
  • Can handle up to 4000 gallons of water
  • Easy to set up
  • Cleaning indicator light
  • Doesn’t require cleaning often
  • Poor instruction manual
  • Canister is made with flimsy plastic

No products found.

The Best Choice Pressure Bio Filter can handle up to 4000 gallons of water in the pond. It can filter up to 2500 gallons with a normal fish load and 1500 gallons with a heavy fish load.

The UV clarifier in this filter helps clean algae and prevent their growth in the pond.

It’s easy to clean the filter due to the backflush feature but it can be a little tough to use. There’s a flow indicator that lets you know when it’s time to clean the filter.

The Best Choice Pressure Bio Filter does not need to be cleaned as often.

Pros Cons
  • Handles up to 4000 gallons
  • UV clarifier
  • Backflush feature
  • Flow indicator
  • Does not need to be cleaned often
  • The backflush feature can be hard to use

Our recommendation

The Goplus Pressure Bio Filter is the best pond filter you can buy in our opinion.

The UV sterilizer helps clean out algae and bacteria from the pond keeping it healthy and suitable for fish.

It’s a strong filter capable of dealing with ponds holing up to 4000 gallons. And it’s quite durable and waterproof.

It’s nice to have the automatic cleaning feature that saves you a lot of time.

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