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Catalog: Main > Pond Installation Tools Black Waterfall Foam Sealant 1  Product Options     Price: $11.99       Product Description   Black Waterfall Foam Sealant 12oz The fast, new way to build waterfalls. Black Waterfall Foam is an expanding polyurethane foam that quickly seals gaps and spaces between rocks in ponds and waterfalls. Unobtrusive, natural look - no need to hide joints 100% fish safe Stays flexible in cold weather Easy to use in all water gardening applications Great for attaching stone to spillway on the MicroFalls