Will bentonite work without draining the pond?

Often yes for small, defined seep areas using the sprinkle method. Broad or severe leaks are best addressed with a drained blanket/compaction application.

How much bentonite do I need?

Coverage depends on soil texture and leak severity. Blanket applications often require several pounds per square foot; spot treatments require less—size by square footage of the leak zone.

Is bentonite safe for fish and wildlife?

Sodium bentonite is an inert clay that swells in water. When applied as directed and allowed to settle before heavy use, it is widely used in aquatic sealing projects.

Will bentonite work on sandy or gravelly soils?

Bentonite performs best when incorporated and compacted with sufficient fines. Very sandy or gravelly subgrades may need higher rates, soil amendments, or alternative sealants.

Bentonite vs. polymer sealants—when to choose which?

Bentonite excels for drained construction or broad-area sealing when proper compaction is possible. Polymer sealants are useful for targeted seep paths or when draining isn’t feasible.

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Bentonite Clay Liner

For most large ponds, bentonite and/or soilfloc are the best choice to retain water.

Help me calculate how much Bentonite I need.

When building on very poor soils a geomembrane liner may be a better choice. EPDM rubber liners are available in a wide range of sizes and can easily be seamed on site. Learn more about pond liners here.

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