Pond Boss Forums GENERAL QUESTIONS Water chemistry Is AG lime just crushed limestone rock

For your use any ole rock would do as long as it doesn't have negative properties.

Concerning lime, consider a 6" diameter solid limestone rock dropped in a bucket of water. Its ability to ammend the water consists of the total surface area measured on the face of the rock.

Now consider that same rock but run through a crusher then a hammer mill grinding into the consistancy of talcum powder. Now dump it into the bucket and consider the many thousands or millions of times surface area of the limestone are exposed to the water.

It is all about the purity of the rock and its surface area exposed to the water. Those two properties give it the ability to alter pH. The finer the grind the more surface area. Big rocks have relatively little surface area.