Patriot 24oz Can Waterfall Foam (3) Pack Special for Waterfall Foam Guns 3 Cans: Seal gaps and fill voids between streambed & waterfall rocks and stones Stabilizes rockwork in Koi ponds, water gardens and pondless waterfalls Moving water travels over (not under!) rocks and stones for dramatic visual effect Fish, aquatic plant and wildlife safe. Perfect for most homeowner and small to medium and large contractor projects. (24oz Cans Dispensed through detachable gun (sold separately)). (Preferred by contractors installing large residential & commercial water features)