How to Run a Clean Koi Pond

A koi pond can be a great addition to any garden. Koi are beautiful fish that live for a very long time. They also reproduce reliably, so if you buy a good stock of koi, you should be able to have a well-stocked pond for a very long time. Fish also help process the water, creating beneficial bacteria, and aiding in the life cycle. A healthy stock of koi can create the complete life cycle in your pond, which helps it to stay healthy. However, koi also produce a lot of waste. The larger koi varieties actually produce a somewhat unexpected amount of waste.


If you’ve ever been standing next to a poorly-maintained pond, a poorly-maintained compost pile, or just a natural pond in the wilderness, you know how badly decay can smell. That’s the smell that you are trying to avoid. Those conditions also attract flies, mosquitoes, rodents, and other undesirable creatures. You need to keep those things away. The best way to do that is to keep a clean pond by reducing the number of plants and animals that can decay. You also need to reduce the amount of algae. Luckily, pond filters are created specifically to tackle all of these problems. The very best filter for a koi pond in your garden will probably have a three step process.

The Filter Pump

The filter pump is not actually a pump that filters anything; the name is misleading that way. It’s more appropriately called a solids-handling pump. This is a pond pump that is capable of passing suspended solids and water through it. It then sends that water and solid matter to a filter that will strain out the solids and leave behind clear water.


They’re absolutely essential if there are any plants or animals near your pond. Leaves can fall from trees into your pond, koi produce waste, and algae can grow on the surface of the pond. All of these things need to be processed and removed. After the filter pump, the water moves to the UV clarifier.

UV Clarifier

The ultraviolet clarifier hits the passing water with a dose of ultraviolet light. UV light has been found to be quite effective at killing certain kinds of bacteria and algae. In addition to killing single celled organisms like algae, UV light causes it to clump together. It then moves to the next stage of the process.


The Filter

The final stage is the filter, which consists of sponges of varying pore sizes. Since the algae and bacteria have clumped together, they can be strained out by the sponges. Also, the sponges tend to house the beneficial bacteria that help break down the algae and waste. These are the same types of bacteria that make a healthy compost pile function well.


These three steps are absolutely crucial for a successful and clean koi pond in your garden. You need all of them to keep your pond from smelling or attracting unwanted guests. If you buy a filter from a reputable retailer, you should have no problems.

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