Pond Sealant bentonite clay is the most efficient, low-cost, and eco-friendly way to fix a pond

Sodium bentonite is a popular sealant used to seal stocks and recreational ponds. As bentonite clay expands significantly when water is applied, it is one of the most efficient yet low-cost methods to repair or create a new pond. Besides, it is a natural mineral and will not harm the fish and plants.

We are involved in the full process of our products. We extract the mineral directly from our mines to assess the mineral quality. While focusing on each application and the different industries we serve, our team of engineers mill and process only high-quality sodium bentonite. Our bentonite works exceptionally well as a pond and lake liner sealant for water leaks.

pond lake filling

Reduce Water Seepage

Lonestar Sodium Bentonite is a High-quality material engineered mostly for use as earth sealants. It swells instantly to create an effective plug when sodium bentonite is exposed to water. This rapidly expanding and ecologically stable composition makes it one of the most acceptable sealants in the world. Sodium bentonite clay is also used to cover and seal wells and patch leakage ponds.

High-Quality Bentonite Clay

Bentonite Pond Sealer is a useful, natural material for solving all water intake problems.

Each batch of Lonestar bentonite is lab-tested, assuring quality before shipping the product. Our experts are always available to guide on bentonite applications.

Please call us with your pond dimensions, type of soil, and we will be glad to assist you in estimating the volume of bentonite needed for your pond.

Pond Sealant Facts

  • Our product applies to many different industries, and our plant offers high-quality control. We are a certified manufacturing plant ISO 9001 certification that warranties our process and the products that we offer.
  • It’s a 100% natural earth material that does not involve other chemicals or hazardous substances.
  • Natural sealant for ponds, lakes, lagoons, water leaks, and hole plugs
  • Sodium bentonite liner blended mix with soil is ideal for water tanks and ponds. Bentonite clay is by far the best product on the market for this type of application.
  • Natural mineral clay is environmentally safe, no toxic, and no chemicals or additives.
  • Safe for fish and wildlife
  • We can also mill the mineral at your mesh requirements and meet your needs to develop new products. This process can be done by blending bentonite using your formulas with the corresponding chemicals and minerals to create your private label product for your market, industry, and needs.

Apply Lonestar Minerals for Excellent Results

It does not require the application of intensive labor. The pond seal may be applied with simple farming tools or construction equipment, particularly when applied during the pond’s construction.

As a leading bentonite pond sealant processor and supplier for the last 50 years, Lonestar Minerals is fully equipped to meet your bulk and small packaging requirements.

It is naturally erosion resistant and lasts for an extended period, mainly if applied using a blanket or blanket method.

Each batch of Lonestar Mineral bentonite is lab-tested, assuring quality before shipping the product.

Our experts are always available to provide guidance on bentonite applications.

Fix a pond and lake

Knowing Your Type Of Soil and Pond Dimensions

The amount of pond sealant to be applied will depend upon the porosity of the soil. The greater the porosity of the ground, the more of the product is needed to prevent seepage.


For the pond, dimensions follow the steps in our helpful tools and recommendations.


For any specific soil conditions, or for more information on how to apply pond sealant bentonite, contact our experts at our contact page or call us to free your worries.

Pond Sealant Application Techniques

While there are three main primary techniques available for applying sodium bentonite pond sealant, 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 sealant 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 sealant 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 2-3 inches into the ground. (Remember: Prevent bentonite from going into deep, because the more profound the product is in the soil, the more the bentonite is diluted.)

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

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

The crucial move in this approach is to till the surface-go deeper in the process between 2 and 3 inches.

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

The Sprinkle Method for Sodium Bentonite Pond Sealant

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.

Lonestar Clay Products

Granular Bentonite

When it comes into contact with water, granular bentonite has a property to swell, forming a gel-like structure.


This product helps fill empty spaces or voids; the product can be used to seal wells to prevent water retreating into natural aquifers.


It could also be used for plugging abandoned boreholes.


The product is mixed with super mud to delay the swelling effect and then discharged into the areas after mixing with water to fill the gaps and voids.

Mix Granular Bentonite Clay (Powder form)

Pond sealant is produced by crushing sodium bentonite. It is ideal for preventing leakage in new or old ponds by applying to the bottom of the pond or by sprinkling along with areas that are either overflowing or are prone to flow.

It can be blended with soil as well. Even applying the product between two layers of soil can prevent seepage.

Sodium Bentonite powder

Bentonite Grount

Some applications require a powdered form of the product. Examples include: well casting or abandoned sealing of drill holes; this product is appropriately formulated and pulverized to function for such applications.

Still, want to learn more?

You may have more questions about sodium bentonite application techniques and our pond sealant 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

You can order our products on the following packaging sizes; we also pack them on pallets, bulk, and full load trucks.

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 sealant 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 sealant:

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.

Sandi 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 optiond 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 sealant, 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 sealant that is a mix mesh powder granular product from fine 200 mesh powder to a 40-mesh mix.

This pond sealant 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 Pond Sealant