Sinking Bentonite Clay – Pond Leak Sealant (50 lb Bag)

Also Available by the Pallet

Fix pond leaks—before they get worse.

Sinking Bentonite Granules – 50 lb Bag for Sealing Leaks in Full Ponds

Fix pond leaks fast—without draining a drop.

This specially screened bentonite sinks directly to the pond bottom and swells on contact with water, sealing leaks from the inside out. Whether you're patching cracks in a dam or plugging mysterious seeps, these 50 lb bags are perfect for targeted leak repair in full ponds—no equipment, liner, or excavation needed.

Why It Works:

• Filtered for Clean Sinking – Granules drop straight down, no clouding

• Swells on Contact – Expands into cracks, gaps, and porous soil

• Self-Spreading Action – Flows into problem zones with water movement

• No Pond Draining Required – Apply directly to surface or slope

Best Use:

• Leaks around pond edges, dams, and spillways

• Narrow seeps that don’t require full bottom coverage

• Ponds that cannot be drained

Application Tips:

• For seeps: Spread a 20-ft-wide strip (10 ft each side of the leak) from shoreline to deep water

• For general sealing: Apply across affected areas at 1–3" depth equivalent

• Combine with wind, wave action, or aeration to help distribute granules

Coverage per Bag:

• 3” Layer (Heavy Seal): ~2.8 sq ft

• 2” Layer (Moderate Seal): ~4.2 sq ft

• 1” Layer (Light Seal): ~8.4 sq ft

Ships fresh. Stock is limited during peak leak season—order now before we run out.

⚠️ Order Early—Demand Surges in Late Summer & Fall

Most pond owners first notice leaks after dry spells or heavy rain. We stock limited quantities during leak season, and it goes fast.
Secure your bags today and stay ahead of costly repairs.

* For full coverage in dry or under-construction ponds, use our 2,000 lb Pallet Bags.

Note: Products are typically shipped via FedEx, Newalla Fish Company reserves the right to deliver your order directly if it improves survival or timing. We won’t refund shipping fees on orders delivered by our team — in fact, it often costs us more than standard shipping, but we do it to ensure the best results.