UltraClear Koi Clay – 100% Sodium Bentonite Pond Clay
Enhances koi color and water clarity.
- 100% sodium bentonite clay adds calcium, magnesium, silica and trace minerals
- Supports koi and goldfish bone and scale development
- Binds fine suspended particles to help improve clarity
- Use 2 tablespoons per 1,000 gallons weekly
- Made in the USA; 4 lb container
Description
A simple mineral boost for your koi pond.
UltraClear Koi Clay is 100% sodium bentonite clay that adds calcium, magnesium, silica and trace minerals to your pond. It supports koi and goldfish vitality while binding fine suspended particles to help improve water clarity.
Support your fish and water together
- 100% sodium bentonite clay: the mix confirmed on the UltraClear Amazon detail page.
- Replenish minerals: supports healthy bone and scale development and electrolyte balance.
- Polish pond water: binds fine particles that contribute to cloudiness.
- Keep care simple: a weekly routine with several easy application methods.
- Natural pond care: made in the USA and backed by more than 30 years of UltraClear experience.

How much to use
Add 2 tablespoons per 1,000 gallons each week, following the product label. Need help estimating your pond volume? Use our pond calculator.
Three ways to apply
- Mix with pond water: gradually add the measured clay to a bucket of pond water while stirring. Distribute the resulting slurry around the pond.
- Coat fish food: roll food in clay before feeding, following the label directions.
- Make clay balls: moisten the clay, roll it into small balls and place them in the pond for slower dispersion.
Common questions
Should Koi Clay dissolve completely?
No. Sodium bentonite clay absorbs water and disperses rather than dissolving. It may eventually settle or be collected by mechanical filtration.
How can I reduce clumps?
Add clay gradually to a bucket of pond water and stir frequently before distributing it. Pouring dry clay directly into the pond can create clumps.
What size is available?
This product comes in a 4 lb container. Measure each dose for your pond volume and maintain the weekly routine.
A simple mineral boost for your koi pond.
UltraClear Koi Clay is 100% sodium bentonite clay that adds calcium, magnesium, silica and trace minerals to your pond. It supports koi and goldfish vitality while binding fine suspended particles to help improve water clarity.
Support your fish and water together
- 100% sodium bentonite clay: the mix confirmed on the UltraClear Amazon detail page.
- Replenish minerals: supports healthy bone and scale development and electrolyte balance.
- Polish pond water: binds fine particles that contribute to cloudiness.
- Keep care simple: a weekly routine with several easy application methods.
- Natural pond care: made in the USA and backed by more than 30 years of UltraClear experience.

How much to use
Add 2 tablespoons per 1,000 gallons each week, following the product label. Need help estimating your pond volume? Use our pond calculator.
Three ways to apply
- Mix with pond water: gradually add the measured clay to a bucket of pond water while stirring. Distribute the resulting slurry around the pond.
- Coat fish food: roll food in clay before feeding, following the label directions.
- Make clay balls: moisten the clay, roll it into small balls and place them in the pond for slower dispersion.
Common questions
Should Koi Clay dissolve completely?
No. Sodium bentonite clay absorbs water and disperses rather than dissolving. It may eventually settle or be collected by mechanical filtration.
How can I reduce clumps?
Add clay gradually to a bucket of pond water and stir frequently before distributing it. Pouring dry clay directly into the pond can create clumps.
What size is available?
This product comes in a 4 lb container. Measure each dose for your pond volume and maintain the weekly routine.
great product
I have an outdoor koi/gold fish pond. It's not huge, about 250 gallons. Trying to regulate the Nitrate/Nitrite levels and PH has been so difficult! I bought this after reading about this product and my fish LOVE this stuff!! My pond is CRYSTAL CLEAR! No more nitrite/nitrate issues at all. I keep a baggie with this clay and their fish pellets in it. Every morning I throw some pellets in the pond for feeding. The clay coats the food. They're waiting for me every morning for their breakfast snack! Can't say enough wonderful things about this product!!
My fish always perk up when I add this to the pond water. I had to figure out a dosage amount that made my fish happy that was different then specified on the container. Some of the clay settles to the bottom of the pond and slowly dissolves.If to much is added the water will look dirty. I have RO water so it stays really clean. I'm not sure if the RO water makes a difference or not. I like it and recommend it.
Didn't clear the water at all. Hopefully the other benefits that I can't see are working. Kind of a hassle having to put it in a pop bottle to dissolve it and then scatter all around the pond. But that isn't the fault of this product, just is what it is.