Will a saltwater pool using DE for the filter kill fescue grass?

DE stands for Diatomatous Earth. It is a type of fine powder like material, which I am sure you can see. Other then being believed to be carcinogenic when breathed. It will not kill any types of grasses, even less hardier ones then fescue.

A: However, the resulting buildup on the ground of the D E after it dries can be harmful to your lungs. City codes could prohibit the depositing of D E or pool water onto the ground in any form.