This publication provides additional information as follow-up to an earlier presentation on behalf of Mississippi Farm Bureau on the difference between water pressure and water volume that should prove useful to commercial poultry producers. Everyone raising chickens knows that an adequate supply of water is necessary to be successful. However, not everyone understands the importance that both water pressure and water volume play in providing an adequate supply. Pressure and volume are two different things, and both are critical to chicken production. Water pressure refers to the force that allows water to flow through pipes, fittings, filters, and distribution lines, overcome elevation, and still reach the drinkers and cool cell pads. The amount of water coming out of the pipe or hose is the volume. A deficiency in either pressure or volume will cause serious water-restriction issues.