Half Off Ponds Black Waterfall Foam Sealant Spray – 12 Pack Expanding Pond Foam for Koi Ponds, Water Features & Rock Gaps – Foam Filler for Waterfalls – 16oz Straw Can, Waterproof Polyurethane

Price: $116.10 - $106.81
(as of Sep 04, 2025 20:04:22 UTC – Details)

From the brand

Your Pond Project Starts Here

From building new ponds to maintaining existing ones, HALF OFF PONDS has the kits, pumps, filters, and aerators you need.

Your Backyard Pond Experts

HALF OFF PONDS is a U.S.-based, family-owned brand offering high-quality pond kits, pumps, liners, and filtration. From koi ponds to waterfalls, we make it easy to build and maintain beautiful, low-maintenance water features. Whether you’re starting fresh or upgrading your backyard, our trusted products and expert support make it easy to turn your backyard vision into reality.

Build Your Backyard Oasis

Complete Backyard Pond Kits

All-in-one kits with liner, pump, and plumbing, build your own koi pond or waterfall with ease and confidence.

Floating Pond Fountains

Add movement, beauty, and aeration to your pond with our energy-efficient floating fountains, built to impress.

Submersible Pond Pumps

Premium Koi Fish Food

Boost koi color, growth, and health year-round with floating pellets in Show & Grow, Grow Pro, and All Seasons formulas.

Simply Clear Filtration

Powerful multi-stage filtration with UV for clear, healthy water, engineered for performance and reliability.

Pond Water Treatments

Pond-Free Waterfall Kits

Enjoy the beauty of cascading water without the upkeep. Easy-to-install kits blend into any landscape naturally.

Durable Pond Liner

Tear-resistant, flexible liner built for long-lasting performance in any pond environment. Easy to shape and install.

Deep Water Aeration Power

Boost oxygen circulation and clarity with energy-efficient, bottom-diffused aeration built for lasting performance.

What makes HALF OFF PONDS unique?

We focus on delivering high-performance pond equipment at competitive prices. From aerators to full pond kits, each product is carefully selected to offer reliability, efficiency, and ease of installation for pond owners of all levels.

Are your pond kits beginner-friendly?

Yes! Our kits include everything you need with clear instructions, so anyone can build a pond or waterfall.

Do you have products for all pond sizes?

From small koi ponds to large fountains, we offer solutions for every scale—pumps, filters, aerators, and more.

Direct the beauty of flowing water exactly where you want it! Half Off Pond’s black expanding foam helps seal gaps between waterfall rocks and streambeds, ensuring water flows over—not under—your landscape features. Ideal for dramatic visuals in koi ponds and pondless waterfalls.
Designed to support heavy rocks and stones, this waterproof foam sealant provides reliable adhesion and structural reinforcement. Perfect for use in pond foam applications, waterfall foam sealant work, and rock glue setups outdoors.
Whether you’re a seasoned pro or weekend warrior, this 12 pack spray foam gap filler is easy to apply with the attached straw nozzle. Preferred by contractors for large pond and commercial installations, and simple enough for home use.
Formulated with high-performance black polyurethane spray foam, it resists UV damage and remains flexible once cured. Expanding foam sealant stays strong in wet environments, making it ideal for landscape foam and outdoor water features.
Each can dispenses easily with a built-in straw, giving you precision control on the job. Whether you’re using it as pond foam sealant or gap filler for waterfall foam applications, it’s the go-to solution for fast, effective results.