Pond Sealant Bentonite



  • Low cost and very effective.

  • Natural sealant for ponds, lakes lagoons, Water leaks and hole plug.

  • Sodium bentonite liner blended and mix with soil is perfect for water tanks and ponds.

  • Natural mineral clay that is environmentally safe, no toxic and no chemicals or additives.

We offer our product bulk, super sacks or 100 to 50 lbs bags. (Minimum order is by 50 lbs. bucket, full pallet or super sack)

Discounted price break down on full truckload orders

We are involved on the full process of our products. we mine the mineral direct from mine, select the quality of the mineral for each application and for the different industries we serve. Our team of engineers mill and process only high-quality sodium bentonite that works extremely good too as a pond liner sealant for water leaks.

What volume of bentonite do I need for my application? Depending on the soil in your area is the amount of bentonite you need.

If you are in Texas soil usually is recommended for sealing ponds to blend a 1 to 1.5 Lbs of mineral per each square foot of your pond.

How much bentonite is needed to add to your soil and create a good seal?  It really depends if your soil is mostly gravel or sandy?

You can test in small scale to determinate exactly what works for you, this is not a rocket science and a good rate to start your test is 1 lb per square foot.

Bentonite clay swells up to 1800% from dry to wet. And maintain swelling creating an impermeable barrier.

No leaks or seeping completely safe for fish and wildlife.

Our product is used in many different industries and our plant offers a high-quality control. We are certified manufacturing plant ISO 9002 certification that warranties our process and the products that we offer.

We can also mill the mineral at your mesh requirements and needs to develop products by blending bentonite using your formulas with the corresponded chemicals and minerals to create your own privet label product for your market, industry and needs.

Application Guidelines

How to Apply Sodium Bentonite Pond Sealant in Different Conditions?

The issue of water seepage in your pond may be troubling you. As the saying goes “Prevention is the cure”, applying sodium bentonite pond sealant during construction stage is a sure and effective way to prevent water seepage problem. If you have already constructed a pond or any other water body and facing water seepage then applying pond sealer bentonite at the bottom can make you free from this nagging issue.

The amount of sealant that you need to apply will essentially depend upon soil conditions of your pond. The following table will help you decide the amount of pond sealer required for different soil conditions.

This table is based on Lone Star GTC quality bentonite 200 mesh.

Soil Conditions Amount of Pond Sealant Required

Per Square Foot

Rock or Gravel 3.0 to 3.5 lbs
Clean Sand 2.5 -3.0 lbs.
Silty Sand 2.0 to 2.5 lbs
Sandy Silt 20% Clay Min 1.5 to 2.0 lbs
Clay Soil 1.0 to 1.5 lbs

For any specific soil conditions, or to know more about the methods of applying pond sealer bentonite, you may contact our experts at our contact page of this website or by phone to become free from your worries!

To calculate your pond square footage size area we need the longest pond length, longest pond width and deepest pond depth.

Pond size Area calculator formula:

1.- Multiply your depth for two and the number needs to be added to the length and also added to the width. (Length + Depth X 2 = X ) and (Width + Depth X 2 = X)

2.- Multiply the resulted number from above formula/length by width. (L X W = Total pond area)

(This formula is not perfect, but will give you a very good idea of your pond size)


Pond Sealant Application Techniques

While three major primary techniques of applying sodium bentonite pond sealant are available, there are a number of factors that you need to consider before selecting a proper application method. The current condition of the pond is of paramount importance along with the depth and the dimensions of the pond. The soil condition is also a crucial factor while deciding on the pond sealant application technique.

The Blanket Method for Sodium Bentonite Pond Sealant

By and large, this is the most effective and popular method for applying pond sealer bentonite. In this method, first of all, any debris such as dead vegetation including roots, logs, moss, trees, rocks, and other unwanted material is removed. After this, almost 4-5 inches of soil is removed, which will be replaced at the end of the process.

In the second step, all gaps, holes or crevices at the surface must be filled with a mixture of 1 part bentonite and 5 parts soil (Depending on the soil and using the above table for references). This is to cover all holes and gaps perfectly that are found at the surface. In the next step, a layer of bentonite sealant will be applied spreading it evenly along the entire bottom surface. In the last step, the 4-5 inches of soil, which was removed earlier, is now replaced thoroughly. The pond is now ready to be filled with water. Care should be taken in maintaining a 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 mixed blanket method also begins with cleaning all debris at the bottom and along entire bed as described in the previous method. Then the important step in this method is tilling of the surface – going deeper between 4 and 7 inches in the process. The purpose is to make the surface smooth and consistent all along the waterbed by dragging the soil.

In the next step, the pond sealer bentonite is applied at the bottom of the pool. A fertilizer or seed spreader can be used for this purpose and care should be taken in maintaining evenness along the bottom of the pond. The pond sealant then is thoroughly mixed with the soil by disking, raking and tilling operations. After completing this process, the soil is then compacted to achieve smoothness of the surface. The pond is then allowed to be filled with a gentle and steady flow of water.

The Sprinkle Method for Sodium Bentonite Pond Sealant

This method of application is selected when it is not possible to drain a pond either due to its size or for any other reason. When leaks are isolated then also this method can be used. The method is obviously less effective than the previous two methods because plants, roots and vegetation’s are not removed from the pond.

In this method, instead of powder, large pieces of bentonite are used so that they can sink easily to the bottom surface of the pond. Usually, these large pieces are sprinkled in the affected area or over the entire pond to stop or reduce seepage of water.

In all above methods of application, it is important to notice that it may take few days for the seepage to stop completely because this is the time bentonite takes to hydrate to its fullest capacity and form a solid lining at the bottom. However, two things are important for superior outcomes: based on your soil type, recommended amount of sodium bentonite per square foot must be applied. Secondly, even distribution of bentonite across the bottom of the pond is crucial for superior results.

Apply Lone Star Bentonite for Excellent Results

Pond Sealer bentonite is an effective naturally occurring material to solve all water seepage problems. As a leading processor and supplier of bentonite pond sealant for last 50 years, Lone Star is fully equipped to meet your requirements in bulk and small packaging. Each batch of Lone Star bentonite is lab tested assuring quality before shipping the product. Our experts are always available for guidance on the application of bentonite and finding soil condition of your pond.

Pond Sealer bentonite is an effective naturally occurring material to solve all water seepage problems. As a leading processor and supplier of bentonite pond sealant for last 50 years, Lone Star is fully equipped to meet your requirements in bulk and small packaging. Each batch of Lone Star bentonite is lab tested assuring quality before shipping the product. Our experts are always available for guidance on the application of bentonite and finding soil condition of your pond.

To know more about our products and to place your order, you can contact us at sales@lonestarbarite.com or through our website contact page.

Lone Star Clay Products

Granular Bentonite

When comes into contact with water, granular bentonite has a property to swell forming a gel-like structure. This helps fill empty spaces or voids; the product can be used to seal wells to prevent water retreating into natural aquifers. The product is ideal to prevent well water contamination. It can also be used to plug abandoned boreholes. The product is blended with Super Mud so as to retard the swelling effect and then it is discharged into the areas after mixing with water to fill up the voids and gaps.

Pond Sealant

Pond sealant is produced by crushing sodium bentonite. It is ideal to prevent leakages in new or old ponds by applying to the bottom of the pond or sprinkling along the areas that are either seeping or prone to seepage. It can be blended with soil as well. Even applying the product between two layers of soil can prevent seepage. The amount of pond sealant to be applied will depend upon the porosity of the soil. The greater the porosity of the soil, the more of the product is needed to prevent seepage.

Bentonite Grout

For some applications, the product is needed in a powdered form. Examples are: well casting or abandoned drill holes sealing; this product is formulated appropriately and pulverized so that it can be applied for such applications.

Bentonite Chips

Bentonite chips are used for sealing wells and boreholes. Sometimes, the product is also known as ‘whole plug’ because it can plug a variety of boreholes and wells. Sometimes, larger particles of bentonite clay are needed; this product with almost 3/8 inch pieces serves the purpose of filling larger holes. Construction of geothermal wells, plugging of wells, and sealing of grounding rods are some of the applications of this product.

These products are produced with utmost care so that they do not spoil underground water or destroy the properties of the soil surrounding the areas where they are used.

Still, Want to Learn More or Looking for Some More Details on Application Techniques?

You may have much more questions about the application techniques of sodium bentonite pond sealant. Lone Star GTC, being a leading supplier of sodium bentonite, will always be eager to reply all your queries of any nature in the matters related to stopping seepage in a pond, or constructing lining for some landfill site, or preventing seepage in wastewater lagoons, or sealing well casing for your new and old wells. Our proven expertise can provide you with the most practical and economical solution. We can be contacted at or service phone number located at the contact page of our website.

Bentonite is our business!

Call us today and we’ll help with any inquiry that you may have or if you need samples.