How to stop Water Hammer?
With this setting, your Rachio controller will open the 'next' scheduled zone to run in a watering schedule, 10 seconds prior to the end time of the current zone that is running.
This will help with the pressure surge that is caused when a zone is abruptly shut and subsequently diverted to a different zone. A smooth transition will now occur, stopping the knocking noise in your pipes and helping the overall system.
To find your water hammer setting, login to your account, select Device Settings > Advanced > Minimize Water Hammer.