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The 15 Best Koi Pond Filters

The filtration system is the most important aspect of a successful Koi aquarium.

It's good to have the right koi and decorations, but it's all futile if you can't keep the fish alive.

However, things can get complicated quickly once you start looking for filters.

Do you have everything needed to operate the filter and how many gallons per hour do you require?

To get the best koi pond filters, you may need to purchase additional accessories for some filters, which can be a hassle when shopping around.

BestForPets (bestforpets.org) hopes these reviews have helped you narrow down your options and order quickly.

Finding the Finest Koi Pond Filters: A Buyer's Guide

You should take your time and get the best filter for your Koi pond. In addition to having to cope with a dirty pond, you may lose fish and incur additional expenses if you purchase an ineffective filter.

But which filter is best for your pond, and how should your Koi pond be set up? To help you select the best filter the first time, we’ve compiled all the information you’ll need.

Do You Know How Much Water Flow Your Pond Requires?

Your pond water needs to be filtered at least once every two hours, so that’s the first thing to keep in mind.

Accordingly, a pond up to 1,000 gallons in size may be maintained with a pump and filter system capable of producing 500 gallons per hour (GPH).

The pump and other accessories needed for many filters are not included in the price of the filter itself. However, if the pump can only move 250 GPH, having a filter that can push up to 500 GPH is useless.

Only the highest-rated component is available. Still, watch out that the pump isn’t forcing an excessive amount of water through the filter.

Too little water won’t hurt the pump or the filter, but too much will destroy the filter and send you back to square one.

Sponge Filters vs. UV Filters

You may choose between UV filters and sponge filters for your pond. Sponge filters aren’t the only ones out there, but they do much the same thing.

The choice between these two is night and day. Sponge filters are effective in capturing and killing microorganisms in water.

There will be a need to clean and eventually replace the filters over time. This isn’t a major change from the traditional method of pond filtration.

UV filters are the alternative. These filters expose your pond to UV light, which kills bacteria and other unwanted organisms. However, a conventional filter is still required for removal of decaying algae and other germs.

Having cleaner water is a huge perk when keeping Koi fish since you can see them better. A UV filter is not required, however it is highly suggested.

Performing Compatibility Tests

Make sure the pond filter you want to buy is compatible with the pump and other components of your pond setup before making a purchase. Most of the time, this entails double-checking the hose diameters and acquiring any required adapters.

In addition, make sure the filter’s opening is big enough to accommodate the pump. If you overload your filter and break it, you’ll have to shell out even more cash for a new one, even though adapters may be ordered after the fact to make things work.

Maintenance Schedules

Despite the fact that your filter is responsible for cleaning the pond, it is still your responsibility to maintain the filter. Large material, such as leaves and sticks, must also be removed to prevent clogging of the filter.

Pond skimming frequency is environment-dependent, however filter maintenance is recommended once every six months.

When the filter gets dirty, all you have to do to clean it is run clean water through it. However, if it doesn’t work, new foam pads should be purchased. They’re cheap, yet a well-maintained filter is essential to keeping your Koi healthy and happy.


You can’t go wrong with the Lifegard Aquatics Trio Pond Fish Pond Filter if you’re still unsure about which filter to buy after reading these reviews. It has everything you need to start filtering your pond and maintain its cleanliness right out of the box.

Add a cheap UV filter, such as the SunSun UV Sterilizer Pond Filter CUV-109, if you’re worried about clarity, and your tank will come out as clear as a bell!

These two items top the list of BestForPets (bestforpets.org) as they are sure to improve the quality of your pond and we hope to find the best koi pond filters.


The Tri Pond Fish Pond Filter by Lifegard Aquatics Is the Best Available Option

  • Highest Possible Flow Rate of 1,000 Gallons Per Hour
  • Submersible sponge filters are a type of filter.

The Koi Pond filter from Lifegard Aquatics, the Trio Pond Fish Pond Filter, is the finest option for those seeking for a complete system. This makes perfect sense.

This kit has everything you need to efficiently filter a pond up to 2,000 gallons, and it does it at a very reasonable price.

The fact that it includes a filter pump makes this a phenomenal bargain in comparison to the alternatives, which are either more expensive or provide less features for the same price.

The pump, fountain spray attachments, and filter assembly are all included in this simple package.

This setup’s only real negative is its short 20-foot power connection, but extension cords may easily solve that problem. Invest in this package if you require a full filtration system and you won’t regret it.


  • An acceptable balance between cost and effectiveness
  • Microorganisms are filtered out using a two-stage, replaceable sponge filter.
  • The pump and water spray connection for the fountain are included.
  • Fully equipped to purify up to 2,000 liters of water


  • The 20-foot power chord is inadequate.


Top-Rated UV Sterilizer Pond Filter: SunSun CUV-109

  • Three hundred and ninety-six gallons per minute is the maximum possible flow.
  • Ultraviolet Filter

This SunSun UV filter might be the perfect solution if you have a smaller pond and already have the pump component. For ponds with a capacity of less than 800 gallons, its maximum flow rate of 396 GPH should be sufficient.

Even though it’s not the biggest pond, the price makes this filter a steal. However, there is more to it than just a low price that makes it the greatest Koi Pond filter out there.

This solution won’t put a strain on your wallet, too, because the 9-watt UV lamp it uses is quite efficient.

In addition to seldom requiring a bulb swap, this system is also very simple to clean. If you don’t already have a pump and other fittings, bear in mind that they aren’t included and don’t buy the filter unless you already have them.


  • Reasonable in cost
  • There is less maintenance involved with UV lighting.
  • The 9-watt design is among the most efficient on the market.
  • Accessory thread sizes accommodate a wide range of pumps.


  • Even so, I’ll need the pump
  • If the maximum flow rate is lower than 800 gallons per minute, then the ponds will be too shallow to wade in.


Top-Rated Savio Stainless-Steel UVinex Pond Filter System

  • No Upper Limit on Flow Rate (treats 2,500-gallon pond)
  • Ultraviolet Filter

The Savio Stainless Steel UVinex Pond Filter System is an excellent investment if you’re searching for an attachment that can clean up just about any pond. Depending on the size of your pond, you may choose between a 26-watt or 50-watt model.

It doesn’t contain any harmful chemicals and may be used around children and pets without worry. It’s also easy to keep up with.

In spite of the fact that this UV filter may be used in conjunction with conventional filter systems, such systems must still be maintained.

When this happens, dead algae floats to the surface of the pond. It will cost extra money to stock up on the supplies you’ll need to maintain a pristine pond.

While the initial investment is substantial, the monthly electricity cost to operate this system should be low. At 12 cents per kWh, it will cost you around $2.28 per month to keep the 26-watt bulb on for a full year.

This increases to a still-affordable $4.38 monthly for the 50-watt filter.


  • Purifies up to 2,500 gallons
  • Simple assembly and no chemicals required.
  • Simple to take care of


  • Expensive
  • Always in tandem with a standard filter


Filter for Pressurized Ponds by SunSun

  • Four Thousand Two Hund Seven Gallons Per Hour Capacity
  • UV Filter with Foam Pads

Even though it’s pricey, the SunSun Pressurized Pond Filter performs a fantastic job of cleaning your pond. Even though a dual filtering system is included, a pump is not.

It can treat ponds up to 8,500 gallons in size and features both a UV lamp and foam pads for optimal filtration. The complete filter is designed to be incredibly small, making it unobtrusive in your pond.

In addition, this filter may be cleaned without disassembling it thanks to an integrated cleaning mechanism. It’s convenient in that it’s simple to set up and keep up, but you’ll have to shell out some serious cash up front.


  • Suitable for ponds up to 8,500 gallons
  • Methods of filtering in abundance
  • The small size makes it simple to conceal.
  • Automatic cleaning feature simplifies upkeep.


  • Expensive


The Uno Fish Pond Filter Kit from Lifegard Aquatics

  • 500 Gallons Per Minute Is The Absolute Top Flow Rate
  • Submersible sponge filters are a type of filter.

It’s impossible to tell the difference between the best overall selection and this Lifegard Aquatics Uno Pond Fish Pond Filter Kit, save for the latter’s higher maximum flow rate.

However, there is no need to spend the extra money on the more robust filter system if your pond is less than 1,000 gallons in volume.

Everything you need to filter a smaller pond is included in this package. The fountain sprays, filter, and pump are all included in the package. Though it’s around $30 less expensive than the leading option, it can only filter half as much.

You can save money by using a smaller system if you’re filtering a much smaller pond, but if you’re nearing the pond’s maximum size, you’ll get better results by upgrading.

However, this is a fantastic option for ponds that are a bit smaller in size.


  • An acceptable balance between cost and effectiveness
  • Microorganisms are filtered out using a two-stage, replaceable sponge filter.
  • The pump and water spray connection for the fountain are included.
  • Includes all components necessary to purify up to one thousand gallons of water.


  • Sadly, the 20-foot power chord is a bit short.


Jebao’s CF-10 Bio-Pressure UV Sterilizer Pond Filter is a cinch to maintain and clean

  • 500 Gallons Per Minute Is The Absolute Top Flow Rate
  • UV filters, bio-balls, and sponges

There’s something special about the bio-balls in the Jebao Easy Clean Bio-Pressure CF-10 UV Sterilizer Pond Filter. In fact, the nitrate bacteria that are produced by them are beneficial to the pond as a whole.

In addition to filtering your whole pond, the UV lights and foam pads help to maintain a healthy ecosystem. In addition, a cleaning indication prompts you to clean the filter when it becomes dirty.

But you’re only receiving the filter and not the pump, and the price is excessive. Second, you may build a pond of up to 1,000 gallons without this filter and for far less money.

The price is a little high for what you receive. When you include in the cost of the filter, fittings, adapters, and pump, filtering a 1,000-gallon pond is really cheaper.


  • Using a Two-Tier Filtration Process
  • Indicator for when it’s time for cleaning and maintenance.
  • Bio-balls are a great way to improve pond health by cultivating bacteria that produce nitrate.


  • Expensive if you only need to replace the filter
  • To clean it, you’ll need to take it apart.


Filter Waterfall for TetraPonds

  • 4.500 Gallons Per Minute Is The Maximum Flow
  • Waterfall Sponge Filter System

There is nothing complicated about the design of our Tetra Pond Waterfall Filter, yet that’s exactly what makes it so efficient. This system may be used to both aerate and filter your pond, eliminating harmful debris and microorganisms.

While it can filter a pond of up to 1,000 gallons in volume, this filter has a maximum flow rate of 4,500 gallons per hour. A smaller pond is hardly the end of the world, but the maximum flow rate might be deceptive.

You’ll need to pay extra money to acquire the hoses and the pump separately, and the filter itself doesn’t come with either. This filter assembly is not the most costly available but it’s also not the cheapest.

Still, the filter is hidden behind the extra-long spillway, so you’ll have a lovely waterfall in your Koi pond.


  • Pumps in fresh air and cleans the water in your pond.
  • A simple design needs less upkeep.
  • The filter is concealed by a particularly lengthy spillway.


  • However, the increased flow rate is only effective for ponds up to a thousand gallons in size.
  • Comes without the required hoses


Our Savio FilterWeir System

  • Ten Thousand Gallons Per Hour Capacity
  • Types of Filters Biotech filter mats and mesh media bags

Consider the Savio FilterWeir Set if you want a waterfall in your pond but your pond is larger than 1,000 gallons. It can filter out a pond up to 20,000 gallons in size with the proper pump.

In addition, it contains bio-tech filter mats and a mesh media bag for thorough pond cleaning. If you have a sizable pond, the massive spillway that this fountain has is exactly what you need.

There is, however, no denying the fact that you will be charged a fee for the use of all these extra functions. It’s a very pricey filter option that only includes the filter housing. The right pump, hoses, and other components are still required for operation.

Unless you have a very large pond, the professional-grade equipment you’re purchasing is probably a bit excessive.


  • This may be used for a pond up to 20,000 gallons in size.
  • Using a Two-Tier Filtration Process
  • Bracket and inlets for attachment are included.
  • The huge spillway produces a massive fountain.


  • Exorbitantly costly
  • For most home Koi ponds, the professional grade is excessive.


Miniature Weir and Skimmer Filter by Savio, 8.5-Inch

  • A maximum of 2,500 gallons per minute
  • Skimmer filters

The Savio Compact Skimmerfilter’s features are a touch lacking for the asking price. There are two filtering pads and the ability to skim your pond, but that’s about it for the benefits of this filter.

A UV light may be added to this filter, but it will cost you more and is available separately. The pump, hoses, and other accessories are all necessary for operation of this system.

You’ll be paying a lot on the filter when there are many of cheaper alternatives that will meet your requirements. The arrangement works well, but the price is too much for my budget.


  • The 5,000-gallon limit has been raised.
  • Uses pond skimmer and filter
  • There are two filter pads


  • Extremely costly
  • Separately, we provide a UV light.
  • Needs further tools


Filter for Underwater Ponds, Tetra

  • A maximum of 250 gallons per minute
  • Submersible sponge filters are a type of filter.

The Tetra Pond Submersible Flat Box Filter is a great option since it is cheap, simple to set up, compatible with a wide variety of pumps, and easy to keep clean.

One major drawback, however, is that it may only be used with a pond up to 500 gallons in size. A Koi fish pond that size is laughably little. It also requires a lot of maintenance and has no unique characteristics.

This filter has to be cleaned nearly every month to keep everything running well, whereas other filters may get away with just a few cleanings each year.


  • Affordable
  • Quick and simple set up
  • Its small size makes it ideal for use with a wide variety of pumps.
  • Simple to disinfect


  • Can only clean up a pond up to 500 gallons.
  • There are no distinguishing qualities
  • Needing plenty of maintenance cleanings

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Dr. Barry Buttler

Dr. Barry Buttler, DVM, MS, DACVIM, is an experienced veterinarian who specializes in the care of small animals, specifically dogs. Dr. Barry K. Buttler is a member of the American Veterinary Medical Association and holds multiple certifications in small animal emergency medicine and geriatric pet health.

Veterinarian (DVM) Dr. Barry Buttler


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