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Best Pond Filter Box | Everything You Need To Keep Your Water Clean

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Your pond’s filtration system is one of the most critical aspects of keeping your pond crystal clear and your fish thriving. However, it’s also one of the areas where pond keepers try to scrimp and save on their budget.

Instead of cutting your budget when your pond’s filtration is at stake, we have put together a guide to help you understand what your filtration system should and shouldn’t be.

We’ve also collected a list of the highest-quality best pond filter box options you have at your disposal. The goal is to help you get the most for your money while also ensuring that your pond is going to be appropriately maintained.

Best Pond Filter Box Reviews

Below is a list of 10 of the best pond filter boxes, UV clarifiers, and pressure systems you can use in your pond. We’ve done the hard work of researching each of the different filters currently available and compared them using an in-depth list of factors that affect your filtration.

Each of the systems below was hand-selected based on our own experience, reviews from other customers, and various types, sizes, and styles of ponds to build a well-rounded list.

High-Surface Area Filter Foams - Recommended
  • Provide Exceptional Biological Filtration Capability.
  • Innovative Flow-Through Filter Design
  • Advance Features Include The Built-In Cleaning Indicator
Adjustable Feed Setting - Best Choice
  • Hangs Easily On Any Plant Hook, Nail Or Small Chain
  • Digital Timer Programs Up To 6 Feed Times A Day, 1 To 20 Seconds Each
  • Directional Shroud Casts Fish Food In A Straight Path
Integrated UV Clarifier - Best Value
  • Help Maintain Clean And Healthy Pond Water
  • Provide Large Surface Area And Unrestricted Water Flow For Improved Cleaning
  • Permanent Control Of Suspended Algae
Strong Filter - High Quality
  • Easy To Clean
  • Cleans Contaminants In The Filter, And A Flow Indicator Lets You Know When To Clean
  • Transform Dirty Green Fish Or Koi Ponds Into A Fresh, Crystal Clear Home For Your Fish
Ecofriendly Filter Kit - Recommended
  • Energy Efficient
  • Quiet Operation
  • Earth Friendly
Easy To Conceal And Durable - Best Choice
  • Works To Keep Your Pond Clean, Clear, And Free Of Green Algae
  • Can Typically Remove Heavy Algae Blooms Within Five Days
  • Help Remove The Algae’s Ability To Reproduce Inside Of Your Pond’s Water
Simple To Install - Best Value
  • Destroy Single Celled Organisms Such As Water Borne Bacteria And Viruses
  • Used To Control Algae And And To Kill Fungi And Protozoa
  • Recommended For Both Fresh And Salt Water Systems As Well As Ponds
Easy To Maintain - High Value
  • Combined Uv And Bio Filtration For Crystal Clear Water
  • Easy Installation Above Or Below Ground Level
  • Perfect For Smaller Ponds
Ideal For Ponds - Recommended
  • Fountain Assembly Includes Three Fountain Heads
  • Submersible Flat Box Filter Keeps Pond Clean
  • Reduces Pump And Fountain Clogging
Dual Filtration System - Best Choice
  • Provide A Clearer And Healthier Pond Or Water Garden
  • Recommend For Use With Pond Pumps Capable Of Pumping
  • Backwash Feature

1. OASE BioSmart 10000 Pond Filter Box - High-surface area filter foams


  • provide exceptional biological filtration capability.
  • Innovative Flow-Through filter design
  • Advance features include the built-in cleaning indicator

The OASE BioSmart 10000 Pond Filter Box is perfect for medium-sized ponds or smaller ponds with a more substantial fish load. The OASE utilizes gravity filters to provide multi-stage filtration. In the box, you get both mechanical and biological filtration.

Each kit comes with the foam filters you need for mechanical filtration while also providing helpful bacteria in the surface area they need to thrive. The increased surface area will require a larger pump. This kit is capable of handling up to 10,000 gallons of water with no fish, or 5,000 gallons with fish.

Pros & Cons


  • This unit provides the highest level of filtration for medium-sized ponds.
  • The filtration system provides automatic cleaning capabilities.
  • The internal temperature gauge helps you monitor your water’s temperature.


  • Some customers complained about the outlet is flimsy.
  • You will need to purchase connectors for the filter’s outlet.

Did You Know?

Make sure your filtration system is installed correctly. A simple kink in the system can prevent the pump from operating correctly, which will cause it to overheat and prematurely fail.


  • Hangs easily on any plant hook, nail or small chain
  • Digital timer programs up to 6 feed times a day, 1 to 20 seconds each
  • Directional shroud casts fish food in a straight path

Another excellent filter box from OASE is the Filtral UVC 700. It is designed to help your pond’s natural ecosystem thrive by promoting healthy bacteria and aquatic biomes. This filter is designed for use in small ponds with lower numbers of fish.

 It’s used best in ponds under 1,000 gallons with the pump able to supply up to 250 gallons of flow per hour. It will provide supplemental aeration in your pond, so your fish and plants are receiving the much-needed oxygen during warmer months.

Pros & Cons


  • The filtration system utilizes an internal UV clarifier to promote healthy bacteria.
  • This is one of the more affordable filtration systems on our list.
  • The kit comes with a pump that is correctly sized to the filter.


  • This kit is best used in ponds smaller than 1,000 gallons in size.
  • We do not recommend using the pump with a fountain or water feature.

Did You Know?

If possible, avoid installing your pond in an area with heavy tree cover. A large number of leaves that make their way into the system can place it under incredible strain.


  • help maintain clean and healthy pond water
  • provide large surface area and unrestricted water flow for improved cleaning
  • permanent control of suspended algae

TetraPond is a well-known brand that started in the gardening industry and worked their way into backyard ponds and water gardens. The Bio-Active filtration system shows their attention to detail and focuses on manufacturing quality products.

The Bio-Active filter is just that, a filter. You will need to supply a pump because the kit does not include one. With that said, the package can be adapted to a wide range of pond sizes based on the size of the pump that you choose to use.

Pros & Cons


  • The filtration system utilizes an internal UV clarifier to promote healthy bacteria.
  • The increased flow rate makes this kit great for large ponds.
  • The high-quality components are easy to install.


  • You will need to purchase a pump separately.
  • Some customers have complained of leaking around the outlet.

Did You Know?

Installing your submersible pond filtration pump at the deepest point in your pond is going to give you the highest level of filtration possible. As the debris settles, it will settle in an area where your filtration system can properly remove it.


  • Easy to clean
  • cleans contaminants in the filter, and a flow indicator lets you know when to clean
  • transform dirty Green fish or Koi ponds into a fresh, crystal clear home for your fish

The Best Choice Products 4000L Pressure Bio Filter is one of the best pond filter boxes for koi ponds that we have found. It is designed for use in ponds 2,500 gallons in size and smaller and can flow up to 4,000 gallons of water per hour.

Because of some of the limitations on the system, we recommend installing this filter box in ponds that are between 3 to 6 feet deep. Smaller ponds may have too much flow from the pump, which can create problems, especially if you have aquatic plants in the pond.

Pros & Cons


  • This filter kit has a fantastic flow rate capable of moving 4,000 gallons-per-hour.
  • The filtration system utilizes an internal UV clarifier.
  • Best Choice Products is well-known for high-quality manufacturing products.


  • Some customers have complained of the flush port leaking.
  • Cleaning the system is more time-intensive than other models.

Did You Know?

If you live in a climate with harsh winters and you need to winterize your pond, consider adding an aeration element after your filter and pump to keep the water oxygenated.

5. POND BOSS Filtration Kit & Pump - Ecofriendly Filter kit


  • Energy efficient
  • Quiet operation
  • Earth friendly

POND BOSS, while being a relatively unknown company, is highly-regarded among customers that have purchased their products. The FM002P system is designed with quality in mind, energy efficiency, and near-silent operation.

One of the best selling points of the FM002P system is that you do not need to purchase a separate pump or filter media. The kit includes the necessary components you need to install it and start filtering your pond’s water.

Pros & Cons


  • The innovative design works excellent with fountains and water features.
  • The price is incredibly attractive and friendly to most budgets.
  • Many customers speak to their water clarity after using this kit.


  • You will need to anchor the filter box to the bottom of your pond.
  • You cannot adjust the fountainhead for different settings.

Did You Know?

Check your pond’s filtration system often. A clogged filter can destroy your pump by causing it to overheat when water is unable to flow through it properly.

6. TetraPond GreenFree UV Clarifier - easy to conceal And durable


  • Works to keep your pond clean, clear, and free of green algae
  • Can typically remove heavy algae blooms within five days
  • help remove the algae’s ability to reproduce inside of your pond’s water

Another great filtration system from TetraPond is the GreenFree UV Clarifier. This is one of the best pond clarifiers that we have found, so if you’re consistently dealing with algae blooms, adding the GreenFree to your filtration system is a good choice.

The GreenFree filter utilizes ultraviolet light to help remove the algae’s ability to reproduce inside of your pond’s water. By limiting their ability to reproduce, you spend less time dealing with green or toxic water, and your fish thrive with high-oxygen content.

Pros & Cons


  • This is an affordable way to combat algae blooms in your pond.
  • The system is easy to install and takes only a few minutes to get up and running.
  • The GreenFree filter can eradicate algae blooms within a few short days.


  • Some customers have complained that it is difficult to install.
  • You will need to reduce your pump’s flow rate to use this system.

Did You Know?

A simple filtration system with multiple stages of filter media is always going to be more effective (and easier to maintain) than a complex system that costs more money to build.


  •  destroy single celled organisms such as water borne bacteria and viruses
  •  used to control algae and and to kill fungi and protozoa
  • recommended for both fresh and salt water systems as well as ponds

The Jebao 36W Aquarium & Koi Fish Pond Sterilizer is another UV clarifier that works great to help combat aquatic organisms, harmful bacteria, viruses, and other potentially toxic substances inside of your pond.

The internal ultraviolet light subjects these smaller organisms to rays that they wouldn’t normally encounter. These rays help prevent them from growing and thriving while starving them of the nutrients they need to get out of control.

Pros & Cons


  • The internal UV light works excellent for limiting harmful bacteria.
  • This kit works great in smaller ponds under 1,000 gallons in size.
  • The unit is simple to install and requires minimal maintenance.


  • The unit tends to work harder than it should in larger ponds.
  • You may have issues finding replacement bulbs.

Did You Know?

Avoid buying the cheapest equipment you can find. While it is excellent for your budget, you will often spend twice as much money (or more) when you have to replace your cheap gear because it failed earlier than the more expensive, higher quality equipment would.


  • Combined uv and bio filtration for crystal clear water
  • Easy installation above or below ground level
  • perfect for smaller ponds

The Fish Mate 1000PUV system is perfect for smaller ponds. It can effectively filter up to 1,000 gallons of water without being under too much strain. The unit is simple to install and can be operating within a few minutes by connecting two separate hoses to your pump.

One of the most significant benefits of the Fish Mate 1000PUV is that you can install it as an external pump or a submerged pump, depending on your needs. This is one of the few systems on our list that can perform dual duties.

Pros & Cons


  • The system is simple to install and easier to hide.
  • Your pond should begin to clear up within a week.
  • The unit is straightforward to maintain.


  • Some customers have complained about leaking at the connectors.

Did You Know?

If you have large numbers of fish, you will want to ensure that your pump can flow more water than what’s in your pond. Increasing the volume and flow on your pump will help keep your pond free from waste produced by your fish.


  • Fountain assembly includes three fountain heads
  • Submersible flat box filter keeps pond clean
  • Reduces Pump And Fountain Clogging

The TetraPond Filtration Fountain Kit is designed to both filters your water while oxygenating it in a combination of the submersible pond filter box and exterior fountainhead. The unit is designed to move up to 325 gallons of water per hour.

While we recommend the TetraPond Filtration Fountain Kit for smaller ponds, some customers have used it in ponds up to 1,000 gallons in size without any issues. However, we do recommend it for ponds under 500 gallons in size.

Pros & Cons


  • The unit is easy to install in your pond once correctly assembled.
  • The all-in-one kit provides filtration, aeration, and a fountain feature.
  • The filter works great and is easy to keep clean.


  • You may need to anchor the system to the bottom of your pond.
  • Some customers have stated that assembling the unit is confusing.

Did You Know?

When you stack your filter media, the power of your pump will need to be increased to flow enough water and maintain proper pressure through the system. This is especially true with multiple layers of mechanical filtration.


  •  provide a Clearer and Healthier Pond or Water Garden
  • Recommend for use with Pond Pumps Capable of Pumping
  • Backwash Feature

Last, but not least, the Jebao CF-10 Pressurized Pond Bio Filter is another small but mighty system designed for use in ponds smaller than 1,000 gallons in size. The unit utilizes both mechanical and biological filtration to keep your water crystal clear.

The internal foam discs are designed to be easy to clean while giving helpful bacteria enough surface area to grow and do their job. The internal UV lamp keeps harmful algae from being able to reproduce and grow out of control.

Pros & Cons


  • This kit is great for ponds smaller than 1,000 gallons in size.
  • The unit is simple to install and performs flawlessly.
  • The filter box is easy to backwash when necessary.


  • You may want to buy a size larger than you think you’ll need.

Did You Know?

If you have large numbers of fish, avoid overfeeding them. Overfeeding creates excessive amounts of waste and uneaten food, which can place your filtration system under stress that wouldn’t happen if you closely monitored your feeding schedules.

Pond Filter Box Buyer’s Guide

Before you spend any of your hard-earned money on a new pond filter box or pond filtration system, you’re going to want to consider a handful of factors.

Each of the factors below was considered while we were researching to put together our list of the best pond filter boxes available. When you’re thinking about buying, consider each of them and your unique situation to determine which setup is going to work best for you.

  1. Pumps

    The most critical part of your filtration system is going to be the pump that you use to move water through the filter box. The pump that you choose should be based on the size of your pond and how much filtration your pond requires.

    The water pump is required to move water through the system, so you will need to think about how much pressure and volume are required. The pressure and amount of water (volume) being moved will determine how well your filtration system works.

    When you are considering which pump to buy, we recommend that you should always invest in the best pump you can afford with your budget. While the pump may cost more upfront, a cheaper pump will wear out quicker, which will cause you to spend the same money twice.

    High-quality pumps, while costing more upfront, also provide a more maintenance-free filtration system, so the added expense greatly pays for itself as time goes on. Higher quality pumps also tend to use less electricity and break less often, which means you save even more money.

  2. Energy

  3. Keeping your pond in tip-top shape is no easy feat. It’s not a cheap one, either. When you are thinking about your filtration system, especially your pump, you’re going to want to determine how much electricity will be required every month.

    The voltage your pump requires will determine how much your electric bill is going to grow. If you have it in your budget, you can eliminate electricity costs by installing solar panels and a battery bank to supply power to the pump.

  4. Size

    The size of your pond plays a significant role in the size of your filtration system, and the volume of water your pump will be required to move.

    While most pond filtration systems can be used in both large and small ponds, based on the size of your pump, some will only work with a specific size.

    As a general rule of thumb, you want a pump that will move at least the same amount of water in your pond every hour. For instance, if you have a 5,500-gallon pond, your pump should be able to move 5,500 gallons of water through your filtration system per hour.

  5. Filtration

    The amount and type of filtration your pond requires is another essential factor to consider before purchasing any equipment.

    If you are keeping a simple water garden with minimal plants and no fish, you do not require the same level of filtration as someone that has a stocked pond with large numbers of plants.

    Take into account the size of your pond while you are thinking about the level of filtration you’re going to require. A simple formula (if you don’t already know how many gallons) is to multiply the length by the width by the depth.

    Then, take into account the number of fish that you keep in your pond to determine the exact level of filtration that will be required.

  6. Type

    For the most part, there are two main types of filtration you’re going to need. The first is biological, and the second is mechanical. You can find systems that are built around both types of filtration, which will work best for most pond owners.

    Biological filtration uses helpful bacteria to offset the number of harmful bacteria in your pond. It will give helpful bacteria enough surface area to adequately feed on the harmful bacteria that pass through the system.

    Mechanical filtration relies on mesh filters to prevent foreign debris from entering into the pump, which can clog it up and destroy the pump. Mechanical filtration works excellent for fish waste, leaves, sticks, twigs, rocks, and other organic material.

    You can also consider using a UV clarifier or activated carbon charcoal to add a third level of filtration to the system. This type of filtration works to remove chemicals and algae from your pond, which helps keep the water’s clarity levels and quality higher.

  7. Location

    The location of your filtration system will also play a significant role in the components that you purchase for your pond. You typically have two different options: submerged or external. Each type has its distinct advantages and disadvantages.

    Submersible filtration systems can be installed directly into your pond. These are most typically used for ponds under 2,000 gallons in size. The biggest downside to a submersible system is plumbing and electrical wiring. However, submersible pumps are more comfortable to blend into your aquascape to help achieve a perfect appearance.

    External systems, on the other hand, are designed to be installed outside of your pond. They are typically larger than submersible systems and can handle ponds up to 21,000 gallons in size.

    The most significant advantage of external filters is the ease of installation. Running plumbing and wiring to a system that is stored outside of your pond is far easier to do. However, these systems are harder to blend into your aquascape and can stand out like a sore thumb.

  8. Budget

    Now that you understand the most critical aspects of your filtration system, it’s time to start thinking about the elephant in the room -- your budget. How much you can afford to spend on the filtration system will play a significant role in the level of filtration you receive.

    If you are on a tight budget, it’s worth spending extra time dialing in the exact specifications and quality you need. You’ll find it a lot easier to save money over buying the best of the best, and most people won’t notice much difference between a high-grade and medium-grade system.

    We do recommend, though, that you set aside as much as fiscally possible. This will ensure you are purchasing high-quality equipment that is built to last and aren’t going to be facing problems down the road when you have to buy the equipment a second time.

    You must create a limit on what you’re willing to spend and work within your budget, but if the difference in buying a piece of equipment with high ratings and one with lower ratings because it costs half as much, we always recommend spending a bit more upfront.

What Is The Best Pond Filter Box?

After extensive research, we have found that the OASE 032209 Filtral UVC 700 Pond Pump & Filter is the best pond filter box currently available.

Affiliate links & Images from Amazon Product Advertising API. Last update on 2022-09-11.

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