Conventional wells are created by drilling or digging into an existing water table. Traditional wells can be shallow, dug by hand or drilled deep into the fresh rock using a hardened "contact point" consisting of a guide point and a screen (perforated pipe). The point is hammered or punched into the ground and the pipe sections are added as needed. When groundwater is found, the well is discharged from the sediments, the pump and the plumbing are installed to push the water into the house's hydraulic system and the well is chlorinated to eliminate any possible contamination. A borehole can reach hundreds of meters in the ground until it reaches the water table.