Plumbing Check alert thresholds

Plumbing Check uses two measurements to determine whether a leak may be present during a test:

• Pressure drop (dP)
  The total drop in water pressure from the start to the end of the Plumbing Check, measured in psi

• Estimated leak diameter (dD)
  An estimated size of a potential leak, calculated using Phyn’s leak detection algorithm and measured in inches

Normal Plumbing Check thresholds

When you run a Normal Plumbing Check from the app, a Plumbing Check alert is sent if any of the following conditions are met:

• dD is greater than 0.02 inches, or dP is greater than 25 psi

• dD is between 0.006 and 0.02 inches and dP is greater than 3 psi

• dD is less than 0.006 inches and dP is greater than 5.5 psi

Extended Plumbing Check thresholds

When you run an Extended Plumbing Check from the app, a Plumbing Check alert is sent if:

• dP is greater than 4.5 psi over a 10-minute period

Extended Plumbing Checks run longer and are designed to detect more subtle leaks that may not appear during a standard test.