Ultimate Koi Clay 20 lbs – UKC20


Calcium Bentonite Clay (100%), Natural Mineral, Montmorillonite

Forumla: Naturally occurring hydrated aluminosilicate of calcium, magnesium, potassium, manganese, sodium, and iron.

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SKU: UKC20 Categories: ,


Water quality is the most important factor in a koi pond or water garden. Koi, goldfish and other aquatic life can survive in less than ideal conditions. One thing pond hobbyists can do to help their fish thrive instead of merely surviving is to make sure that the minerals and trace elements found in natural ponds are in the water of their koi ponds and water gardens. In almost all cases, the water used to fill our beautiful ponds is deficient in most of the minerals and trace elements needed to allow our koi and goldfish to reach their maximum potential. What little minerals you have in your pond water are quickly absorbed by the fish, plants and even the bacteria that colonize your filters. Unfortunately, most of the water used for our ponds comes from the tap, which is often a poor substitute for providing a healthy aquatic environment for your fish. Minerals and trace elements are necessary for the optimum health and development of our fish. The only way those minerals can be replaced or introduced is through water changes and additives. The highest quality koi in the world are raised in mud bottom ponds. Even the top koi breeders have to add fresh clay to their ponds to replace the minerals and trace elements needed to raise these incredible living jewels.

The leading koi experts in the world agree that the type of clay which contains the most minerals and trace elements is bentonite / montmorillonite clay. There is very little, if any, bentonite clay in our yards and gardens. This type of clay has to be mined and processed to a consistency that will allow you to add it to your pond. Even though there are mines in several places around the world, not all bentonite clays contain the same level of minerals. That is why we spent the time and effort researching to find the best source to make sure our clay is high in the needed minerals for your fish. You can be assured that "Ultimate Koi Clay" has been laboratory tested to confirm it will provide the proper minerals for your fish when used according to our dosing instructions. Try it and you will see the difference in your water, your fish and your pond.

Calcium Bentonite Clay (100%), Natural Mineral, Montmorillonite

Forumla: Naturally occurring hydrated aluminosilicate of calcium, magnesium, potassium, manganese, sodium, and iron.

"KOI CLAY" is a naturally occurring calcium bentonite clay, which is available from only a few of the bentonite mines in the world. It goes into suspension very well and is ideally suited for recirculating koi and garden ponds. Our clay is all-natural and we purchase it directly from the mine and have it processed to the consistency needed for your use. Nothing is added to detract from the makeup of the clay and its minerals as it is found in nature. You can depend on receiving exactly what the leading koi experts use. Compare our price to other montmorillonite clay products and you will be pleasantly surprised. We have made the cost affordable for the backyard pond and koi enthusiast.

How it Works:
Ultimate Koi Clay and other fine bentonite clay products appear to dissolve when mixed with water, but they only go into suspension. The clay is made up of billions of microscopic particles. Below is an image of bentonite clay at different magnifications up to 20,000 times it’s original size. As these particles spread out and settle in the pond they adsorb and absorb toxins from the water.

[Magnified Ultimate Koi Clay]

The best explanation I’ve seen on how calcium bentonite clay removes toxins comes from clay expert Ran Knishinsky.

"Technically, the clay first adsorbs toxins (heavy metals, free radicals, pesticides), attracting them to its extensive surface area where they adhere like flies to sticky paper; then it absorbs the toxins, taking them in the way a sponge mops up a kitchen counter mess."

After that occurs the clay can be filtered out of the pond via your mechanical filter or vacuum.


Use one level tablespoon of "KOI CLAY" for each 1,000 gallons (US) of water every other day for the first two weeks. Beginning the third week only dose one or two days per week. You can dissolve "KOI CLAY" into a container of pond water and pour it evenly around the pond, or make it into a mud ball and lay it in a gently flowing stream of water so it dissolves slowly.

The minerals contained in "KOI CLAY" are beneficial to all living things. They benefit your plants and fish, as well as the bacteria living in your filters. "KOI CLAY" will remove toxins (heavy metals, free radicals, and pesticides). "KOI CLAY" literally attracts these elements like a magnet and then sucks them up like a sponge. This causes the entire "mess" to settle so it can be removed by a good mechanical filter, or screened out manually. All this improves water clarity and quality.


"KOI CLAY" can be sprinkled on moistened fish food pellets or added to homemade paste foods. If you moisten the pellets you can also put them into a plastic bag containing "KOI CLAY" and shake it so the clay powder evenly covers the moist pellets. Spread them out onto a cookie sheet to dry and you can feed them later. Feeding your koi and goldfish calcium bentonite clay aids in their digestion as well as removing toxins from their bodies. By improving your fish’s digestion it decreases the amount of waste they produce which in turn reduces the load on your filter thus improving water quality.


Within two or three weeks you will see an improvement in your water as well as the skin quality of your koi and goldfish. The colors will be more vivid, and the white ground brighter. Your fish will show increased appetites and vigor.


"KOI CLAY" can be added to your potting soil or garden dirt. You can sprinkle it on the surface of potted plants or mix it with the water when watering your plants. "KOI CLAY" will add minerals lacking in your garden soil and improve the nutrition as well as the flavor of your vegetables. It also improves disease resistance in your plants.

Gene Winstead
Koi Clay, LLC

Additional information


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Pond Water Treatments

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Koi Clay