Bentonite Clay For Pond Use

Bentonite Clay Pond Sealing in Devon: Natural Solutions for Leaky Ponds

If your pond is losing water or struggling to hold a consistent level, you may be dealing with a leaky pond — a common issue across Devon, Dartmoor, and the wider South West. Many ponds built on sandy or stony soils simply don’t retain water well, especially in dry summers. The good news? You can fix it naturally with bentonite clay pond sealing.

What Is Bentonite Clay?

Bentonite is a natural clay formed from volcanic ash. When wet, it expands dramatically, filling tiny gaps and forming a watertight barrier in the pond bed. This makes it a natural, eco-friendly alternative to plastic liners or concrete, ideal for wildlife ponds, farm ponds, and natural swimming ponds alike.

Why Choose Bentonite for Pond Sealing?

• 100% natural and wildlife-safe – no plastic or synthetic materials
• Self-sealing properties – expands and contracts with moisture
• Blends into the landscape – ideal for rewilding and habitat creation
• Long-lasting and low-maintenance when properly installed

Unlike artificial liners, bentonite creates a living, natural pond base that supports plant growth and wildlife from the start.

DIY Bentonite Pond Repairs – Common Pitfalls

It’s tempting to try a quick fix by scattering bentonite clay across the water or adding a thin layer to the base. However, without proper soil preparation, compaction, and moisture control, the clay can clump or wash away — leaving your pond just as leaky as before.

At Sasaquatics, we’re often called in to repair failed DIY or poorly installed bentonite projects. The difference lies in how the clay is applied and integrated with your soil.

The Sasaquatics Method: Natural Pond Sealing That Lasts

We specialise in bentonite pond sealing across Devon and the South West, combining soil science, hydrology, and ecological restoration expertise. Our process ensures your pond holds water naturally and becomes a thriving habitat for wildlife.

Here’s how we approach it:

1. Soil & Hydrology Assessment – We test subsoil permeability and water sources to design the most effective solution.

2. Site Preparation – The pond bed is graded, cleared of debris, and shaped for optimal compaction.

3. Bentonite Application – We mix the correct amount (usually 5–10 kg per m²) into the top layer of soil to form a seamless, watertight barrier.

4. Moisture & Compaction Control – Using the right moisture balance ensures the clay bonds evenly throughout the pond bed.

5. Refilling & Habitat Creation – As the pond refills, we monitor settlement and reintroduce native plants to promote biodiversity.

Ideal for Rewilding and Natural Pond Projects

Whether you’re restoring a traditional farm pond, creating new wildlife scrapes, or developing a natural swimming pond, bentonite offers a sustainable solution that supports both biodiversity and beauty.

Our team at Sasaquatics brings together rewilding principles and hands-on pond construction expertise. We don’t just stop leaks — we help you create resilient, thriving ponds that blend seamlessly into the landscape.

Bentonite Pond Sealing Services in Devon and the South West

Sasaquatics provides pond sealing, repair, and restoration services across Devon, Dartmoor, Somerset, and Cornwall. We work with private landowners, farmers, estates, and community projects, offering:

• Leaky pond diagnosis and soil testing
• Bentonite pond sealing and repair
• Pond design and reshaping
• Rewilding and wetland restoration advice
• Natural swimming pond construction

Get a Quote or Site Visit

If you’re based in Devon or the South West and your pond is leaking, or if you’re planning a new natural pond project, we’d love to help.