This tool is just what I need to remove old grout from the seams of my brick chimney. With a hammer and chisel I did more in an hour than in a day and a half. It's powerful enough to work quickly but small enough not to damage the bricks, and I worked with it for three hours without tiring. bigger compressor. My hand-carrying Ingersoll Rand P1IU-A9 twin-stack 2-HP compressor (3.2 cfm at 90 psi) worked so well that I was able to continue working with short breaks to stretch and reposition. If someone was re-laying a large wall and had scaffolding that they could move easily, they would probably find that they needed a slightly more powerful compressor.