Hydro dam operators have been sealing stop logs with our products since 1985 to seal sluice gates, head gates,tainter gates, stop logs and cracks in concrete or rock structures.

Natural Cinders is a new, proven STOPLEAK solution for sealing stop logs that quickly seals gates & stop logs and is environmentally friendly.


Before Natural Cinders


After Natural Cinders

After years of using coal cinders to seal our sluices either for work on the downstream side or to minimize seepage, we had to stop using them. We kept looking for a better solution, J.M. Power Aggregates introduced us to Natural Cinders which is a lot more environmentally friendly and after using it, I can say it is more efficient for sealing.

Operations Foreman

Ottawa River, Ontario Canada

“It’s all about results!” – Check out our results video!

Video description: This time-compressed video shows Plant Staff applying Natural Ciders on the upstream side of a dam.
Within 2 minutes 45 seconds the water leakage below the dam logs is dramatically reduced.

Animated view of the addition of Natural Cinders (left) matched with “real life” results (right)

Video description: This time-compressed video shows an animation beside real-time footage of a leaking dam. The animation shows the falling and sealing behaviour of Natural Ciders applied on the upstream side of the dam. Within 2 minutes 33 seconds the water leakage below the dam logs is dramatically reduced.

“Live Action” example of Natural Cinders at work

Video description: This video illustrates the sealing properties of Natural Cinders in a tall water test tank with a hole punched into the side at the bottom left. As the Natural Cinders are added to the top of the tank they fall to the bottom and are drawn to the water outflow at the punched hole. The sealing properties of Natural Cinders quickly seals the hole and the water flow stops.