Pond Boss Forums MANAGING AN EXISTING POND Corrective stocking New Pond Owner - Suspect Many Many Bullhead

Aglime (tiny pieces of limestone) = safe by the ton. Very slow release.

Hydrated lime (very fine powder) = very dusty, used to kill fish sometimes. Quick release, affects ponds much, much faster.

There are chemical differences as well as the physical ones. Try breathing both of them by accident and the difference is obvious.