Nuanchu Granular Bentonite Clay 20 lb — Pond Sealant, High-Expansion Natural Soil Liner

Nuanchu 20lb Granular Bentonite Clay is an all-natural, high-expansion clay designed to create a flexible waterproof barrier for ponds, lakes, dams, and other containment uses.

This granular bentonite comes in a 20-pound bag and swells when wet to form a low-permeability seal that helps stop leaks and stabilize pond edges. It’s calcium-rich, nontoxic to soil, and commonly used as a soil liner, leak repair product, or binder for various applications. Nuanchu’s granular form is easy to mix into soil, compact, and cover, making it practical for do-it-yourself pond maintenance and larger landscape projects.

How does Nuanchu bentonite stop water loss in ponds and tanks?

When the granules contact moisture they absorb water and expand into a dense, pliable mass that fills voids and coats soil particles. This expanding layer reduces permeability and creates a continuous barrier that slows seepage through soil and rock. Proper mixing and compaction are key to achieving an effective seal.

• Expands up to 15x when hydrated, filling gaps and cracks.
• Forms a flexible, low-permeability layer that moves with soil.
• Works best when blended into the topsoil and compacted.
• Ideal for earthen pond bottoms, edges, and shallow leak zones.

What is the recommended application method for effective sealing?

Drain or lower the pond water before applying to exposed soil. Mix the bentonite evenly into the upper layers of soil, compact the mixture, then cover with 2–4 inches of clean soil or sand to protect the clay blanket and maintain moisture for activation. For smaller repairs, apply gradually and allow the water to clarify before reintroducing fish.

• Drain/partially drain pond; expose the repair area.
• Mix Nuanchu granules evenly into soil at a recommended ratio for your site.
• Compact the amended soil thoroughly to eliminate air pockets.
• Cover with clean soil or sand to protect the seal and retain moisture.

Can this bentonite be used with fish, plants, or other pond features?

Nuanchu bentonite is a natural clay and is generally safe for use around ponds, but avoid dumping large amounts directly into water with fish or delicate aquatic plants. Apply in stages and allow water clarity to return before restoring normal biological activity. For heavily stocked or sensitive ecosystems, consult a pond specialist before large-scale treatments.

• Do not add large doses straight into water where fish are active.
• Apply gradually and let sediment settle before reintroducing wildlife.
• Compatible with earthen liners, waterfall edges, and farm ponds when used properly.
• Safe as a soil amendment and binder once mixed and covered.

What other uses and benefits does this granular bentonite offer?

Beyond pond sealing, granular bentonite is versatile—use it as a binder in foundry sand, a component in cat litter, a dry mold material for crafts, or for general soil stabilization. Its high water absorption and swelling make it useful wherever a natural, flexible seal or absorbent material is needed.

• Works as a component in cat litter for clumping properties.
• Useful in foundry and molding applications as a binder.
• Helps stabilize soils around pipe seals, livestock tanks, and dams.
• Natural, chemical-free clay with broad landscape uses.

Who is this for? Nuanchu 20lb Granular Bentonite Clay is aimed at landscapers, pond owners, hobbyist water gardeners, and farmers who need a natural, cost-effective way to reduce seepage and reinforce soil structures. It’s also a handy material for craftspeople and small-scale industrial uses where an absorbent, expandable clay is beneficial. If you need a do-it-yourself friendly, natural pond liner or a multipurpose clay product for soil sealing and binding tasks, Nuanchu offers a practical 20-pound supply for regular maintenance and repair projects.