I'm going to chime in here and offer a non educated opinion. Having had chickens, their droppings are very strong an acidic. Aged, it makes for a great fertilizer.

On the other hand Cow manure contains a mixture of grass, straw, and grain. The way I see it, grain is used in making flour, and straw used in making bricks and adobe. Every grade school kid has made paste out of flour, it is a great bonder.

Therefore I believe cow manure would be a better choice in sealing a pond.

Last edited by scruffy_fish; 07/28/08 01:16 PM.