Fix any leak with sodium bentonite.

Best pond sealer in the USA

Sodium bentonite is a natural mineral that seals leaks in any pond regardless of its state, whether the pond is old, new, dry, or has water and fish. Sodium bentonite clay will reduce water loss.
Sodium Bentonite is one of the most efficient yet low-cost methods to repair or create a new pond.

Pond after sodium bentonite application.
Pond after sodium bentonite application.

How Bentonite leak sealer reduces the seepage?

Bentonite Pond Sealant can apply to full or dry ponds.

When sprinkling Sodium Bentonite on the water it will sink and deposit itself at the bottom of the water tank soil pores and cracks, sealing them within a couple of days.

If the pond is dry or building a new pond, the pond sealer can be applied as a pond liner, creating a permeability barrier very efficient, low-cost, and long-lasting seal.

The Bentonite sealer’s working principle is based on the natural property to absorb water and expand itself up to 10 times or more that is useful for solving all water intake problems.

Bentonite Pond Sealer Advantages

  1. Volcanic ash that is a 100% natural earth material that does not involve other chemicals or hazardous substances.
  2. It is naturally erosion resistant and lasts for an extended period, mainly if applied using a blanket or mixed method.
  3. Is environmentally safe, no toxic, and no chemicals or additives. Safe for fish, plants, stock, and swimming – Eco-Friendly.
  4. The pond sealer clay is applied with simple farming tools or construction equipment, mainly during the pond’s construction.
  5. Each batch of bentonite is lab-tested, assuring top quality product before shipping the product.
  6. We are a certified manufacturing plant ISO 9001 certification that warranties our process and the products that we offer.
  7. We are involved in the full process of our products. We extract the mineral directly from our mines to assess the mineral quality.
Bentonite pond sealer
Sodium Bentonite Powder
Loading a truck with Bentonite Pond Sealer
Loading a truck with Bentonite for ponds

How much Bentonite pond sealant do I need?

To determine the pond sealer amount that a pond needs, we must know the pond’s area and the type of soil.

The amount of pond sealer per square foot depends mainly on the soil’s porosity. The higher the porosity of the ground, the more product is needed to prevent seepage. If you know the type of soil, you can find the recommended amount per square foot in our Helpful tools section,

To approximate the pond’s area. we multiply twice the most-depth point of the pond and add the resulting number to the length (L). And we also add that same number to the width (W), and we multiply both results L + (Depth times two) x W + (Depth times two), and the resulting number will be our estimated pond area.

To facilitate the calculation of the amount of Bentonite you have to use, you can use our Bentonite & Pond Area Calculator.

For any specific soil conditions, or for more information on how to apply pond sealer bentonite, contact our experts at our contact page or call us directly at our free 1-800 number to free your worries.

Do you need help fixing a pond?

If you are having problems sealing a pond, we have the solution.

We provide full service to fix ponds and lakes. We’ll supply the necessary equipment, operators, and mineral to seal your pond and offer you a turn-key job.

Talk with our experts they will tell you how we can help you to fix your pond.

machinery preparing then pond for pond sealing application
machinery preparing then pond for pond sealing application

What our clients say about our services and our pond leak sealer clay

“My business is simple. I design ponds. Lonestar has been my main supplier of bentonite for the past 7 years. They are honest, hard-working, and have never let me nor any of my clients down.


With pleasure, I sure do recommend them!”


Alex Hankins


“Lonestar Bentonite declares to have a high-performance product. The product seems to work as advertised. We’re very pleased with the results so far. Every day, it seems to be better. I highly recommend this product, as I tried other options on the market and didn’t work as well as this one.”


Pat Talamas


How to use bentonite clay for ponds

While there are three main primary techniques available for applying sodium bentonite pond sealer, there are several factors you need to consider before selecting a proper application method.
The pond’s current state, along with the depth and dimensions of the pond and the soil quality, is of paramount importance when deciding on the application of the sealer to the pond.

The Blanket Method for Sodium Bentonite

This method is by far the most effective and popular method for bentonite pond sealer application.

First, any debris such as dead vegetation, including roots, logs, moss, trees, rocks, and other undesirable material must be removed in this method.

In the second step, all surface gaps, holes, or crevices must be filled with a mixture of 1 part of bentonite and five parts of soil (depending on the ground and using the reference table below on our Helpful Tools & Recommendations section.

This method is to completely cover all holes and gaps that are found at the surface.

A layer of bentonite pond leak sealer will be applied in the next step, spreading it to create a nice evenly blanket along the entire surface.

Once the bentonite has been applied on top of the surface, it is required to till it in or disk it in, just about 3 ~ 4 inches into the ground and compact. (Remember: Prevent bentonite from going into deep, because the more profound the product is in the soil, the more the bentonite is diluted.)

After you have compacted the bentonite, and if possible, you can spray water, wet the treated ground, and compact again.

The pond is now ready to be filled with water. Care should be taken in maintaining smooth and steady water flow in the pond so that soil or bentonite layers are not disturbed.

The Mixed Blanket Method for Sodium Bentonite Pond Sealant

The goal of this method is to have a very soft and even pond bottom.

As mentioned in the previous method, the mixed blanket method also begins with cleaning up all debris at the bottom and along the entire bed and then fill the holes.

The crucial move in this approach is to till the surface-go deeper in the process between 3 and 4 inches.

The purpose is to make the surface smooth and consistent by dragging the soil all along the waterbed.

Then apply a layer of Bentonite-soil mixture accordingly with the recommended ratio of bentonite per sqft area, cover it with 4 inches of soil, and compact. The final layer must be thicker if your livestock is going to have access to the pond.

Tractor Working on Pond
Tractor working in a pond with Bentonite

The Sprinkle Method for Sodium Bentonite Pond Sealer on a pond with water

Do you want to minimize water leakage in your lagoon or pond? Do you want to avoid the drainage of a water tank?  Sodium bentonite sprinkle method of applying and treating your pond liner to plug water drains.


This application method is used when a pond cannot be drained, either because of its size or for some other reason. When leaks have isolated, this approach can also be used. The process is less successful than the two previous methods, as there is no removal of trees, roots, and vegetation from the pond. And this method is not as accurate when sprinkled above water (could be a hit and miss).

In all application methods, it is important to notice that it may take a few days for the seepage to stop entirely because this is the time bentonite takes to hydrate to its fullest capacity and form a solid lining at the bottom. However, it is critical to know this for superior results: the required amount of sodium bentonite per square foot must be applied based on your soil type.

Truck sprinkling sodium bentonite
Truck sprinkling sodium bentonite in a lake

Still, want to learn more?

You may have more questions about sodium bentonite application techniques and our pond sealer product. Being a leading supplier of sodium bentonite, Lonestar Minerals will always be eager to answer any questions.

Our proven expertise can provide you with the most practical and economical solutions.

We can be contacted through our contact page or via our main phone number. Call us today, and we will be pleased to provide you with a free quote, send you samples of our products, or answer any questions you might have.

Available Packaging Sizes

We can supply Bentonite Pond Sealer in different packing sizes to meet your needs.

Order it by the full truckload (FTL) on pallets, super sacks, bulk, pneumatic trailer, or less than a full truckload (LTL) and by the pallet or super sack.

50 lbs
Sodium Bentonite Plastic Bucket


Product Packaging Information: 50 lbs. Plastic Bucket.

Weight:  50 lbs.

Dimension: 5 Gallon Bucket

Buckets per Palette: 30

Buckets per Full Truck Load: 540 – 18 pallets

50 lbs
Sodium Bentonite Bags


Product Packaging Information: 50 lbs. bags

Weight:  50 lbs.

Dimension: 18″ x 14″ x 4″

Bags per Palette: 50

Bags per Full Truck Load: 900 – 18 pallets

100 lbs
Sodium Bentonite Bags


Product Packaging Information: 100 lbs. bags

Weight: 100 lbs.

Dimension: 25″ x 18 x 4

Bags per Palette: 25

Bags per Full Truck Load: 450

3000 lbs
Super Sack


Product Packaging Information: Super Sack no pallet

Weight: 3,000 lbs. Each Pallet

Dimension: 48″ X 48″ X 63″

The full Truckload is 45,000 lbs.

Bags per Full Truck Load:  15



Our super sacks come with four straps on top so that it comfortable to lift. They also come with a discharge valve at the bottom that quickly unties, and the client can begin pouring the bentonite into the desired area. Customers must have equipment at their location to unload the weight of 3,000lbs. Usually, our customers use an excavator, bobcat tractor, or a forklift for unloading our product.

The super sack’s height is approximately 60″ to 63″ high and consider the additional height for the loops/ straps 10″ ~ 14.”

Full Truckload  of 100 Lbs
Bags Pallet


Product Packaging Information: 100 lbs. bags full truckload

Pallet Weight: 2,500 lbs. (25/100 lbs. bags)

Pallet Dimension: 48″ X 48″ X 63″ Full truckload is 45,000 lbs. (45/100 lbs. bags)

Pallets per full truckload: 18 Pallets.

Full Truckload of 3000 Lbs
Super Sack


Product Packaging Information: Super Sack no pallet

Weight: 3,000 lbs. Each Pallet

Dimension: 48″ X 48″ X 63″

The full Truckload is 45,000 lbs.

Bags per Full Truck Load:  15

To unload from the flatbed truck, you’ll need equipment and an estimate of 10 feet height

Helpful Tools & Recommendations

How do I determine how much Bentonite is needed per square foot to seal my pond?

Depending on the type of soil on your pond and the pond’s size, how much sodium bentonite clay we can recommend applying.

The following table will help you decide the required amount of pond sealer needed concerning the square foot of different soil conditions.

This table is based on Lonestar Minerals quality bentonite mix mesh powder for ponds.

Powder mix mesh granular Pond sealer:

Soil condition:                  Amount of bentonite clay:

Rock or gravel: 3.0 to 3.5 lbs. of bentonite per square foot area.

Clean Sand: 2.5 to 3.5 lbs. of bentonite per square foot area.

Silty Sand: 2.0 to 2.5 lbs. of bentonite per square foot area.

Sandy Silt 20% Clay Min: 1.5 to 2.0 lbs. of bentonite per square foot area.

Clay soil: 1.0 to 1.5 lbs. of bentonite per square foot area.

How do I calculate the area of my pond?

Pond Size Area Calculating Formula:

Step 1.- Multiply your depth of deepest point by two, and the resulting number needs to be added to the pond’s length dimension.

Then repeat this process, multiply your depth of deepest point by two, and the resulting number needs to be added to the width dimension of the pond.

(Length + Depth x 2= “X”) and (Width + Depth x 2= “Y”)


Step 2.-Then, multiply the resulting number from both equations, from the above formula.

(L X W = Total Pond Area)

*This formula gives a reasonable approximation of the size of your pond.

To estimate the area of a Circular Pond:

Follow this process below!

Step 1.- You will need to measure the circumference of the pond. Once you have acquired those measurements, you will divide the circumference by two times pi. This resulting number is the radius of the pond.

Pond Circumference / (2 X Pi) = Pond Radius

Step 2.- Once you have solved for your radius. You will square the radius and multiply it by pi.

(Radius^2) X Pi = Pond Area

Feel free to contact our experts through our contact page or give us a call for any questions or concerns. We can calculate the square footage for you! (To calculate your pond square footage size area, we need the longest pond length, longest pond width, and deepest pond depth).

What options do I have for delivery and trucking services available for our clients?

We offer our product delivered at any of our warehouses.

The main warehouse is in Laredo, TX. also has a warehouse in Eagle Pass and Bulverde, TX. (11 miles North of San Antonio TX.)

Or we can also ship directly from Wyoming mines depending on your location and the logistics cost.

We offer a delivery service, and we can coordinate delivery from less than a full truckload order to a complete truckload order. (Please call us for a landed price quote).

Our headquarters are in San Antonio, TX.

What equipment is needed for unloading our product from delivery truck?

You’ll need equipment to unload 3,000 lbs super sacks or 2,500 lbs pallet from a flatbed truck.

These super sacks have straps on top to grab with your tractor, excavator, front loader, bobcat, or forklift.

Please make sure you can lift a 3,000 lbs super sack since must of the time. The Super Sacks do not have wooden pallets underneath; if you require pallets, please call and request it on your order (cost per pallet will be added to your order).

All our super sacks come with a very efficient discharge valve. The discharge valve is located underneath the Super Sack. To efficiently release the pond sealer, you must pick up the sack and untie the valve to start pouring the liner on top of your soil.

What other services are offered to build, fix or treat my pond?

Besides offering our bentonite clay for your leaks and seepage, we also offer the service to apply and treat your soil.

We design, reshape, or build new lakes and ponds.

What are the physical Specifications of our different mesh size particles of our line of products?

We offer a particular milled clay product for pond sealer that is a mix mesh powder granular product from fine 200 mesh powder to a 40-mesh mix.

This pond sealer is by far the best product for this application.

If you were to use a granular bigger particle size chips, you would need twice or three times as much to perform as good. (Please see the picture of our product so you can have a better idea of our product) to give you an idea, if you hold our product in your hand, it will feel like you were holding beach sand.

Request a Quote for Bentonite Pond Sealer

This information will help us to give you an accurate quote and the right amount of pond sealer that you will need, this will help you to save water and money.

Pond Sealant Quote
Pond Information *
Current pond information *
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