Need help choosing the best pond filter for koi?
Koi ponds add incredible beauty and serenity to a landscape, providing an amazing focal piece to any backyard. While many of the requirements and maintenance is the same as a regular fish pond, with a koi pond it’s imperative the water is incredibly clean and well maintained. Koi are more sensitive to water debris, and stressed koi are more susceptible to disease and infections. Buying a high quality filtration system will ensure the pond water is clean.
In this article we are going to talk about 5 of the best koi pond filters, so let’s get started.
What is the best pond filter for koi?
Here is a quick preview of the top 5 options
- TetraPond Clear Choice Biofilter
- Best Choice Products 4000 Liter Pressure Bio Filter with UV Sterilizer Light
- Flexzion Pond Pressure Bio Filter with Ultraviolet UV Sterilizer Light System
- Easy Pro Pond Products Pond Skimmer
- Atlantic Waterway Gardens Pond Filter & Waterway Spillway
Tips for choosing the right filter
There are a handful of different types of pond filters available for purchase. They vary in their function and each serves a purpose. In larger ponds they can be combined in a system to provide added filtration.
In-pond pre-filters are designed to work best in small pond systems, mechanically removing small particles. They attach to the pond pump intake and filter water through a sponge filter.
Skimmers are a large box mounted outside the pond liner at the water level. They are usually strictly mechanical in nature with no bio-chambers they continuously draw in surface water to catch large debris before it settles to the bottom of the pond.
Pressure filters work in small to medium-sized ponds, using pressure to force water through a sponge filter that collects small debris particles.
Waterfall filters – also known as gravity return filters – are non-pressurized and have a significant amount of biological filter materials in them, making them best suited for small to medium ponds with fish.
With many options available on the market today, it’s easy to construct a filtration system to meet all the needs of a treasured koi pond. Let’s take a look at a few options.
This TetraPond Clear Choice Biofilter is a pre-filter designed to mechanically filter small to coarse debris out of the pond water while providing a massive amount of biologic filtration media for beneficial bacteria to colonize. It relies on a separate pump to move water from the pond into the filter, but can be set up for of the pond for easy accessibility.
Pond water is pumped into the filter where it passes through two separate layers of foam, filtering the debris out of the pond water. Beneficial bacteria colonize on the surface area of the biological media and work to convert the harmful ammonia and nitrite pollutants found in the water into nitrate, which is absorbed by aquatic plants.
The next on our list is the, Best Choice Products 4000 Liter Pressure Bio Filter with UV Sterilizer Light.
Incredibly efficient, and easy for the homeowner to maintain, this newer to the market product is capable of filtering up to 12,000 liters per hour of pond water. The Best Choice Products pressure filter is suitable for 2500 gallon ponds with a normal fish level and ponds up to 1500 gallon if the fish load is high.
A higher fish load will cause a biologic filter to work harder to convert the ammonia and nitrite in the pond water to nitrate, so it cannot handle as large of a pond volume if the fish concentrate is high.
The Best Choice Products 4000 Liter Pressure Bio Filter with UV Sterilizer Light includes an integrated 13W UV clarifier and UV lamp indicator to reduce algae concentration in water. It is designed to not be submerged in water and does not include a pump.
Highly rated for its quality and efficiency, the Flexzion Pond Pressure Bio Filter with Ultraviolet UV Sterilizer Light System is designed for filtering normal pond water to remove dirt and debris, while aiding in the biologic conversion of ammonia and nitrite to nitrate and stopping algae growth.
The pressure filter is easy to install and simple to clean. A flow indicator tells when to clean the filter; a clean function uses a backflush system to wash filter sponges on its own.
The Flexzion Pond Pressure Bio Filter with Ultraviolet UV Sterilizer Light System can be purchased in different capacities, handling ponds from 800 to 3200 gallons. An integrated UV clarifier utilizes ultraviolet irradiation to remove algae and other disease-causing organisms from the water, helping create a healthy environment for koi fish.
Does this pond skimmer have what it takes to be the best pond filter for koi? We think it just might. With an innovate design and faux landscape rock cover on this skimmer makes it blend in easily with the features surrounding a pond. The Easy Pro Pond Products Pond Skimmer provides essential mechanical filtration for koi ponds.
Install this skimmer at the water line to draw in surface water; the filter will catch large debris before it settles to the bottom of the pond and begins to decompose. A separate pump needs to be purchased to use in conjunction.
The Easy Pro Pond Products Pond Skimmer has a maximum flow rate of 75gpm or 4500gph providing great filtration. Factory design ensures that all of the water entering the skimmer passes through the filtration net to catch a higher rate of dirt and debris. This skimmer is a great component for odd-shaped ponds where numerous skimmers need to be plumped into one single pump.
Atlantic’s filter products offer performance and upgradeable options that every pond builder and homeowner will appreciate. The Atlantic Waterway Gardens Pond Filter & Waterway Spillway is a massive workhorse that can accommodate up to 3 filter mats and a variety of available biomedia.
The external design features a sturdy top grate and support bar that allows for easy camouflage with rocks or other pond decorations. A one-piece flange attachment on the Atlantic Waterway Gardens Pond Filter & Waterway Spillway makes for easy installation. Reinforced body prevents warping and deformation for years of worry-free filtration service.
Keeping the water crystal clear in a koi pond is easier to do when the system is outfitted with high quality filters. The above mentioned products serve unique purposes but are all great components for any home koi pond. Money well spent on a good filtration system will prevent many headaches and hours of frustration down the road.
What do you think is the best pond filter for koi? Please share with us your experience in the comments below.